007 PHYSICAL DESCRIPTION FIXED FIELD (R) MICROFORM
00 Category of material h Microform 01 Specific material designation a Aperture card b Microfilm cartridge c Microfilm cassette d Microfilm reel e Microfiche f Microfiche cassette g Microopaque u Unspecified z Other | No attempt to code 02 Undefined (Original versus reproduction Obsolete) f Facsimile [OBSOLETE] o Original [OBSOLETE] r Reproduction [OBSOLETE] u Unknown [OBSOLETE] 03 Positive/negative aspect a Positive b Negative m Mixed polarity u Unknown | No attempt to code 04 Dimensions a 8 mm. d 16 mm. f 35 mm. g 70 mm. h 105 mm. l 3x5 in. or 8x13 cm. m 4x6 in. or 11x15 cm. o 6x9 in. or 16x23 cm. p 3 1/4 x 7 3/8 in. or 9x19 cm. u Unknown z Other | No attempt to code 05 Reduction ratio range a Low reduction b Normal reduction c High reduction d Very high reduction e Ultra high reduction u Unknown v Reduction rate varies | No attempt to code 06-08 Reduction ratio 09 Color b Black-and-white c Multicolored m Mixed u Unknown z Other | No attempt to code 10 Emulsion on film a Silver halide b Diazo c Vesicular m Mixed emulsion n Not applicable u Unknown z Other | No attempt to code 11 Generation a First generation (master) b Printing master c Service copy m Mixed generation u Unknown | No attempt to code 12 Base of film a Safety base, undetermined b Not a safety base [OBSOLETE] c Safety base, acetate undetermined d Safety base, diacetate i Nitrate base m Mixed base (nitrate and safety) n Not applicable p Safety base, polyester r Safety base, mixed t Safety base, triacetate u Unknown z Other | No attempt to code