Source: Aluminum: American Metal Market, Metal Statistics, 1975.
Copper Copper Development Association, Annual Data,

1976.

Lead and Zinc: Bureau of Mines, Minerals Facts and Prob

lems, 1975.

355 I.C.C.

64 65 66 67 68 69 70 71 72 73 74

ANNUAL OBSERVATIONS

Source: Steel: American Iron and Steel Institute, Newsletter.

Paper American Paper Institute.

355 I.C.C.

P

E

R

C

E

N

T

1.

Figure 2.3a

RECYCLED MATERIAL AS A PERCENTAGE (%) OF
TOTAL DOMESTIC MATERIAL PRODUCTION

Figure 2.3b

RECYCLED MATERIAL AS A PERCENTAGE (%) OF
TOTAL DOMESTIC MATERIAL PRODUCTION

Copper

Lead

Zinc

50 52 54 56 58 60 62 64 66 68 70 72 74 ANNUAL OBSERVATIONS

Source: Copper Copper Development Association, Annual Data,

1976.

Lead and Zinc: Bureau of Mines, Minerals Facts and Prob

lems, 1975.

355 I.C.C.