Caterpillar D9 Tractor Operation and Maintenance Instructions, for Serial Numbers 49A1 - Up, 50A1 - Up, originally published by Caterpillar Tractor Co., Peoria, Illinois, October 1960. Reprinted by Nation Builder Books, Leesburg, VA, 2007. 6 x 9 paperback, 92 pages, plus a 9 x 12 inch fold-out Lubrication Chart.
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