David,
Here's the info you're looking for:
ANSI
PO Box 30200
Hartford, CT 06150-0200
(v) 212-642-4900
(f) 212-3-2-1286

ANSI/EIA-481-1-A-1994  $32
for 8mm and 12mm
ANSI/EIA-481-2-1991 $32
for 16mm and 24mm
ANSI/EIA-481-3-1991 $32
for 32mm, 44mm and 56mm

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