45 cmerican … method of building the locks at Pacific end of canal. Sand and stone One of the concrete mixers dumping its load into steel cars for transportation Porto Bello, a small hamlet about 20 miles east of »m the stock pile to the mixers, and from the mixers the concrete to the overhead cableway that…
Plaster · Mold · Center · Bounding · Boiled · Gatun · Pedro miguel · Scientific American · Plaster sides · Iron core · Final positions · American july · Square abcd · Stove pipe · Cubic yards · Plaster mold
Internet Archive · Public domain (published before 1931). Free to use for anything.
