Cost-benefit analysis of the initiative to accelerate the digitizing of 7.5-minute maps (Q85012)

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Cost-benefit analysis of the initiative to accelerate the digitizing of 7.5-minute maps; 1993; OFR; 93-351; Gillespie, S. R.
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Cost-benefit analysis of the initiative to accelerate the digitizing of 7.5-minute maps
Cost-benefit analysis of the initiative to accelerate the digitizing of 7.5-minute maps; 1993; OFR; 93-351; Gillespie, S. R.

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