Code 130 - Coded Data Field: Microforms - physical attributes (R)Indicators: blankSubfield codes $a Microform Coded Data Physical Attributes $a/0 Specific Material Designationa = aperture card b = microform cartridge c = microfilm cassette d = microfilm reel e = microfiche f = microfiche cassette g = micro opaque h = microfilm slip z = Other$a/1 Polaritya = positive b = negative d = mixed polarity u = unknown$a/2 Dimensionsa = 8 mm (microfilm) d = 16 mm (microfilm) f = 35 mm (microfilm) g = 70 mm (microfilm) h = 105 mm (microfilm) 1 = 3x5 in. (8x13 cm) (microfiche or micro opaque) m = 4x6 in. (llx15 cm) (microfiche or micro opaque) o = 6x9 in. (16x23 cm) (microfiche or micro opaque) p = 3 1/4 x 7 3/8 in. (9xl9 cm) (aperture card) u = unknown z = other$a/3 Reduction ratioa = low reduction b = normal (16x 30x) c = high (31x 60x) d = very high (61x 90x) e = ultrahigh (9lx ) u = unknown v = varies$a/4-6 Specific reduction ratioIf a value is given, right justify with zero fill. If a single digit is missing sing, replace by 'u'. If the ratio is unknown, fill with blanks.$a/7 Coloura = monochrome b = colour u = unknown v = varies$a/8 Emulsion on filma = silver halide b = diazo c = vesicular u = unknown v = mixed emulsion x = not applicable z = other$a/9 Generationa = first generation (Master) b = printing master c = service copy u = unknown v = mixed generations$a/10 Base of filma = safety base b = not a safety base (e.g. nitrate) u = unknown x = not applicable