Sources Abbreviations:
AAT: Anglo-Australian Observatory, David Malin https://images.datacentral.org.au/malin/AAT
AIP: Astrophysikalisches Institut Potsdam http://www.aip.de/science/Atlas.html
AIT: Institut für Astronomie Tübingen http://astro.uni-tuebingen.de/groups/pn/
APD: Astronomy Picture of the Day http://antwrp.gsfc.nasa.gov/apod/archivepix.html
ASP: Astronomical Society of the Pacific http://www.astrosociety.org/resources/ngc.html
Astroveto: Edmund Georgii, France https://www.astroveto.com/
ATNF: Australia Telescope National Facility http://www.atnf.csiro.au/people/bkoribal/pictures.html
Balick: Bruce Balick, Univ. of Washington, Seattle http://www.astro.washington.edu/balick/
BBS: Universe, Winsen, DE http://astro.goblack.de/
Bello: Ezequiel Bellochio, Arg http://www.astropilar.com.ar/index.html
Block: Adam Block https://www.adamblockphotos.com/nebulae.html
BobM: Bobby Middleton, Texas http://www.koyote.com/users/bobm/astro2.htm
Bridle: Alan Bridle http://www.cv.nrao.edu/~abridle/images.htm
Budassi: Pablo Carlos Budassí https://www.facebook.com/thecelestialzoo
CFHT: Canada-France-Hawaii Telescope http://www.cfht.hawaii.edu/
Chandra: X-Ray Observation Center, Cambridge, MA http://chandra.harvard.edu/index.html
Chuck: Chuck Vaughn, US http://astrophotography.aa6g.org/
Chumack: John Chumack, Dayton http://www.galacticimages.com/catalog/gallery.php
CCook: Chris Cook, California http://www.abmedia.com/astro/
Comolli: Lorenzo Comolli, Italy http://www.astrosurf.com/comolli/
Crisp: Richard Crisp, Montebello http://www.narrowbandimaging.com
Croman: Russell Croman, Austin, Texas http://www.rc-astro.com/
Cselig: Courtney Seligman, Long Beach, California http://cseligman.com/index.htm
CUK: Chungbuk National University, Korea http://astronote.org/bbs/board.php?bo_table=messier
Deforeit: Chris Deforeit http://astrim.free.fr/
DRAGN: Double Radiosource Associated with Galactic Nucleus http://www.jb.man.ac.uk/atlas/index.html
DSC: Deep-Sky Corner http://deepsky.astronomie.info/
DSS: Digitized Sky Survey, STSCI http://stdatu.stsci.edu/dss/
DVers: Daniel Verschatse, Antilhue, Chile http://www.verschatse.cl/
ESA: European Space Agency, Garching, Germany http://www.spacetelescope.org/images/index.html
eESA: database http://archives.esac.esa.int/ehst/#search
ESO: European Southern Observatory, Garching, Germany http://www.eso.org/public/images/
Fera: Bob and Janice Fera http://www.feraphotography.com/
Fenyes: Loránd Fényes, Piliscsév, H http://fenyeslorand.hu/
GaBany: R Jay Gabany, San Jose http://www.cosmotography.com/
Geiss: Rolf Geissinger, Remseck, Germany http://www.stern-fan.de/
Gendler: Robert Gendler, Connecticut http://www.robgendlerastropics.com/
Gralak: Ray Gralak, California http://www.gralak.com/
Guisard: Stephane Guisard, Chile http://sguisard.astrosurf.com/
Halderman: Mike Halderman http://www.mrh.org/dss.html
Hallas: Tony and Daphne Hallas, Foresthill, California http://www.astrophoto.com/
Hetlage: Chris Hetlage, Atlanta http://www.hetlage.com
Hibbard: John Hibbard, Charlottesville http://www.cv.nrao.edu/~jhibbard/
Higa: Yoshitaka Higa, Japan http://www5e.biglobe.ne.jp/~m_star/
Hogg: David W. Hogg, NY http://cosmo.nyu.edu/hogg/rc3/
HST: Hubble Space Telescope, STScI, Baltimore http://hubblesite.org/newscenter/
Hubl: Bernhard Hubl, Austria http://www.astrophoton.com/index.html
INT: Isaac Newton Telescope, David Malin http://www.aao.gov.au/images/general/int_misc.html
IPAC: Infrared Processing and Analysis Center http://coolcosmos.ipac.caltech.edu/image_galleries/missions_gallery.html
Ivanov: Emil Ivanov, Varna, BG http://www.emilivanov.com
JML: Jerry Lodriguss, New Orleans http://www.astropix.com/
JPL: Jet Propulsion Laboratory, Caltech, Pasadena http://space.jpl.nasa.gov/
Judy: Judy Schmidt, NY https://www.flickr.com/photos/geckzilla/
JW: Jason Ware, Richardson, Texas http://www.galaxyphoto.com/
Kitahara: Yuuji Kitahara, Nagano http://www.janis.or.jp/users/kitahara/english-index.html
Kodama: David A. Kodama, California http://www.eanet.com/kodama/astro/
Kohle: Sven Kohle, University of Bonn http://www.allthesky.com/nebulae/nebulae.html
Koprolin: Walter Koprolin, Vienna http://astro.nightsky.at/
Lau: Angus Lau, Australia https://anguslau.smugmug.com/Nature/Astro/
Locke: Dick Locke, US http://www.dl-digital.com/astrophoto/Nebula-home.htm
Lorenzi: Marco Lorenzi, Vicenza, Italy http://www.astrosurf.com/lorenzi/
Lula: Brian Lula, Princeton http://www.heavensgloryobservatory.com/
M: SEDS: Univ. of Arizona, Hartmut Frommert http://www.messier.seds.org/
Mancini: Marco Mancini, Italy http://www.osservatoriomtm.it/
Matt: Matt BenDaniel, Boston http://starmatt.com/
MCook: Mike Cook, Huntertown, Indiana http://www.af9y.com/
McLa: William McLaughlin http://nightskypictures.com/
Mendez: Bryan J. Méndez, Berkeley http://cse.ssl.berkeley.edu/bmendez/index.html
Misti: Jim Misti, Arizona http://www.mistisoftware.com/astronomy/index.htm
NAO: National Astronomical Observatory of Japan http://www.nao.ac.jp/
NED: NASA Extragalactic Database http://nedwww.ipac.caltech.edu/
NOAO: National Optical Astronomy Observatories, Tucson http://www.noao.edu/image_gallery/WIYN/images.html
NOIRLab: National Optical-Infrared Astronomy Research Laboratory https://noirlab.edu/public/images/
NRAO: Nat. Radio Astronomy Observatory, Socorro http://www.nrao.edu/
Orazi: Leonardo Orazi, Italy http://www.starkeeper.it/gallery.htm
Perkins: Philip Perkins, Wiltshire, UK http://www.astrocruise.com/
PR = HST: Hubble Space Telescope http://hubblesite.org/newscenter/
RAS: Rochester Academy of Sci, NY http://www.rochesterastronomy.org/snimages/reference/
Rhemann: Gerald Rhemann, Austria http://www.astrostudio.at/all.php
Russell: Matthew T. Russell, Minneapolis http://www.telescopes.cc/nebulae.htm
Schedler: Johannes Schedler, Austria http://panther-observatory.com/deepsky.htm
SkyMap: Sky-Map.org, Canada http://www.sky-map.org
SDSS: SkyView-DSS, GSFC http://skyview.gsfc.nasa.gov/cgi-bin/titlepage.pl
S-DSS: Sloan Digital Sky Survey http://www.sdss.org/gallery/gal_data.html
SIMBAD: Centre Données astronomiques Strasbourg http://simbad.u-strasbg.fr/Simbad
Spitzer: Spitzer Space Telescope http://www.spitzer.caltech.edu/images
Tagoshu: Tago Shusaku, Japan http://tagoshu.cool.ne.jp/astro_photos/astro_photos-e.html
Thommes: Jim Thommes, San Diego, US http://jthommes.com/Astro/index.htm
UA: The University of Alabama, Bill Keel http://www.astr.ua.edu/Galleries.html
UH: Univ. of Hawaii http://www.ifa.hawaii.edu/ao/
Voltmer: Sebastian Voltmer, Saarbrücken http://www.astronom.de/
Webb: Telescope, NASA https://www.jwst.nasa.gov/content/webbLaunch/news.html
Wittich: Reinhold Wittich, Geisling, D http://www.wittich.com/
Yohkoh: Montana State University http://solar.physics.montana.edu/YPOP/
Zhang: C. Y. Zhang, University of Calgary http://www.ucalgary.ca/~zhangc/pnimage.html
  
Arp: Dr. Halton C. Arpg: Galaxies page
G.: GlobularO.: Open
ic: Index Cataloguen: Nebulae page
Pl.: PlanetaryNgc: New General Catalogue
V.cl.: Virgo clusterUgc: Uppsala General Catalog of galaxies

Collection by Janos Rohan, Hungary
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