Sequence: Print portfolios and single prints are arranged in chronological order wherever possible. In some instances, prints having the same image but different dates are placed side by side. In order to preserve the catalogue numbers from the first edition of Andy Warhol Prints, the letter a or b is used when an early print omitted from that catalogue has been added.

Measurements: Height precedes width in inches; metric measurements, in centimeters, are given in parentheses. Measurements indicate the size of the paper. If image size is much smaller, both the image and sheet dimensions are given.

Signatures and Marks: Although sometimes the prints are signed and numbered on verso, in most instances they are signed and numbered on the front in either pencil, ball point or felt pen. All prints are numbered in Arabic numerals unless otherwise noted. Some prints are just initialed; some are also dated. Prints completed after Warhol's death bear special estate stamps and signatures on verso. Wherever possible, we have indicated the location of the signature and number, based on the prints photographed. However, this may vary within any given edition. 

Proofs: Abbreviations used in this catalogue are as follows:
AP - Artist's Proofs, which are of quality equal to the edition, numbered as AP 1, etc. In some Deluxe Editions, 
DEAP appears with the number. 
PP - Printer's Proofs, which are of quality equal to the edition, numbered as PP 1, etc. In some Deluxe Editions, 
DEPP appears with the number; in some Special Editions, 
SEPP appears with the number. 
EP - Exhibition Proofs, which are of quality equal to the edition, numbered as EP 1, etc. These are prints produced for exhibition purposes. 
HC - Hors Commerce prints, which are of quality equal to the edition, numbered as HC 1, etc. They are often produced for collaborators. 
TP - Trial Proofs, which are prints pulled during the proofing process to document color changes in the edition. They are made into small editions and numbered as TP 1, etc. If there are Artist's Proofs or Printer's Proofs, TPAP or TPPP appears with the number. In most instances, we have not photographed Trial Proofs because each is a unique print, but we have documented them. 
BAT - Bon A Tirer. The trial proof selected to be the image for the edition. It means ready to print.

Paper: The prints described in this catalogue are printed on the following papers. If the exact paper is not known, just the color is indicated in the text. 
Arches Cover - mouldmade in France, 100% rag, acid-free and buffered, watermarked 
Arches 88 Silkscreen - mouldmade in France, 100% rag, made for Warhol without watermark 
Black Arches - mouldmade in France, 100% rag, acid-free and buffered 
Carnival Felt Cover - machine made 
D'Arches Watercolor (Cold Press) or (Rough) - mouldmade in France, 100% rag, watermarked, chopmarked 
Dutch Etching - mouldmade in Holland, 50% rag, acid-free 
Essex Offset Kid Finish - machine made, 100% rag, acid-free 
Fabriano CMF - mouldmade in Italy, 100% rag, acid-free, watermarked 
J. Green - handmade, 100% rag, acid-free, watermarked 
HMP - handmade, 100% rag, acid-free, watermarked 
Italia - mouldmade in Italy, 50% rag, acid-free, watermarked 
Lenox Museum Mounting Board (2 ply) - machine made, 100% rag, acid-free 
Rives BFK - mouldmade in France, 100% rag, acid-free and buffered, watermarked 
Somerset Satin White - machine made, 100% rag, acid-free, watermarked 
Stonehenge - machine made, 100% rag, acid-free 
Strathmore (3 ply plate) - machine made, 100% rag, chopmarked

CREDITS:
Article taken from Feldman Schellmann "Andy Warhol Prints" Catalogue Raisonné 1962-1987. Buy the book HERE. Free shipping.