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.
Caterpillar D7 Tractor Operation and Maintenance Instructions, for Serial Numbers 17A1 - Up (Form 31389-2), originally published by Caterpillar Tractor Co., Peoria, Illinois, May 1956. Reproduced by H & S Tech Publications, Biglerville, Penn., 2010. 5 1/2 x 8 1/2 paperback, 84 pages, plus half page addition to Lubrication Chart.
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