Letters and financial documents by Pennock and Sievers, 1910-1913

This series contains mostly pocketsize bound volumes, which document the construction of the Rio Grande Dam and water levels in the reservoir. The "Force" books document in detail the dam construction labor force while the tally books record numbers of workers and progress and the delay books record times and reasons for work delays. There are also two letter books of outgoing correspondence and several accounting ledgers, which detail customer accounts and daily expenses. The materials are grouped in no particular order.