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a) District of Columbia Area Summary Notes:
Film Type Length  weight in tons
Nitrate Film 35mm[1] 13,656,836 34
Acetate Film 35mm [2] 247,000 3/5
Acetate Film 16mm 1,833,225 2-1/4
Nitrate Still Negs[3] 1,822,964 91
Acetate Still Negs. 34,040 1-7/10
Glass Plates[4] 454,304 56-1/2
Aeriel Cut Films[5] 62,315 3
Aeriel Survey rolls[6] 476 4/5
X-Ray Films[7] 75,585 3-1/4
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b) Outside D.C Area Summary
Nitrate Film 35mm 3,624,204 9
Acetate Film 35mm 2,388,559 6
Acetate Film 16mm 1,914,947 2-1/2
Nitrate Still Negs 903,884 45
Acetate Still Negs. 100,431 5
Glass Plates 281,281 55
Aeriel Cut Films (nitrate) 45,525 2
Aeriel Survey rolls (nitrate) 51,439 90-4/5
X-Ray Films 3,538,474 177
c) Summarized totals
Nitrate Film 35mm 17,281,040 43
Acetate Film 35mm 2,635,559 6-3/5
Acetate Film 16mm 3,748,172 4-3/4
Nitrate Still Negs 2,726,848 136 (Gregory Original has error @ 2,737,109)
Acetate Still Negs. 134,471 6-7/10
Glass Plates 735,585 91-1/2
Aeriel Cut Films (nitrate) 107,840 5 (Gregory Orginal has error @ 105,840)
Aeriel Survey rolls (nitrate) 51,915 90-4/5
X-Ray Films 3,614,059 180-3/4 (Gregory Original has error @180-7/10)
565-1/10 tons total tonnage (est)

[1]
Note: assumes 1,000 ft of 35mm film weighs about 5 lb, less rells and container

[2]
note: assumes 1,000 feet of 16mm film weighs about 2.5 lbs, less reel and containers

[3]
Notes:  Assumes still film weighs about 10 to the lb, less jackets

[4]
Notes: assumes that Glass plates weigh about 4 ea to the lb in paper jacket

[5]
notes:  same as still film

[6]
notes : Assumes Aeriel rolls weigh about 5.5 lbs in factory container
:

[7]
notes:  calcualte same as still film, but tends to be heavier due to increased size.

[8]
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