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Caterpillar tractors and donkey engine at loading site, with flatbed railroad log cars and shack in background,
1. Caterpillar tractors and donkey engine at loading site, with flatbed railroad log cars and shack in background, Simpson Logging Company camp no. 5, ca. 1940
One of West Fork Logging Company's first Caterpillar tractors being unloaded from a flatbed railroad
2. One of West Fork Logging Company's first Caterpillar tractors being unloaded from a flatbed railroad car, with Heisler locomotive in background, 1936
Loading site with loading crane, bulldozer and Caterpillar tractors with arches and winches, Simpson
3. Loading site with loading crane, bulldozer and Caterpillar tractors with arches and winches, Simpson Logging Company, probably in Mason County, n.d.
Loading crew with loading crane and Caterpillar tractors with arches and winches for yarding logs, camp
4. Loading crew with loading crane and Caterpillar tractors with arches and winches for yarding logs, camp 3, Simpson Logging Company, near Shelton, ca. 1935
Loading site with loading crane, bulldozer and Caterpillar tractors with arches and winches for yarding
5. Loading site with loading crane, bulldozer and Caterpillar tractors with arches and winches for yarding logs, Simpson Logging Company, probably in Mason County, n.d.
Loading site with donkey engine and Caterpillar tractors fitted with yarding arches and winches, camp
6. Loading site with donkey engine and Caterpillar tractors fitted with yarding arches and winches, camp 1, Simpson Logging Company, Mason County, ca. 1927
Loading site, with loading crane, bulldozer, and Caterpillar tractors with arches and winches for yarding
7. Loading site, with loading crane, bulldozer, and Caterpillar tractors with arches and winches for yarding logs, Simpson Logging Company, probably in Mason County, ca. 1940
Loggers at loading site with Caterpillar tractors and arch yarders, Schafer Brothers Logging Company,
8. Loggers at loading site with Caterpillar tractors and arch yarders, Schafer Brothers Logging Company, probably in Grays Harbor County, ca. 1942
Loggers using Caterpillar tractors and arch yarders, Schafer Brothers Logging Company, probably in Grays
9. Loggers using Caterpillar tractors and arch yarders, Schafer Brothers Logging Company, probably in Grays Harbor County, ca. 1942
Caterpillars used by WPA in clearing the Grand Coulee Reservoir, ca. 1940
10. Caterpillars used by WPA in clearing the Grand Coulee Reservoir, ca. 1940
Logger using Caterpillar tractor and arch yarder, Simpson Logging Company, camp no. 1, ca. 1925
11. Logger using Caterpillar tractor and arch yarder, Simpson Logging Company, camp no. 1, ca. 1925
Logging crew at yarding operation using a Caterpillar tractor and log yoke, West Fork Logging Company,
12. Logging crew at yarding operation using a Caterpillar tractor and log yoke, West Fork Logging Company, ca. 1939
Loading site with caterpillar tractor fitted with winch, camp 3, Simpson Logging Company, near Shelton,
13. Loading site with caterpillar tractor fitted with winch, camp 3, Simpson Logging Company, near Shelton, ca. 1935
Loggers with Caterpillar tractor fitted with yarding arches and winch, camp 5, Simpson Logging Co., Grays
14. Loggers with Caterpillar tractor fitted with yarding arches and winch, camp 5, Simpson Logging Co., Grays Harbor County, ca. 1940
Crew and Caterpillar diesel tractor equipped with pipe layer sideboom engaged in construction of ALCANGO
15. Crew and Caterpillar diesel tractor equipped with pipe layer sideboom engaged in construction of ALCANGO pipeline, between Haines and Fairbanks, August 2, 1954
 
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