Forty-eight unpublished items in three volumes. V.1- Hydrological reports include water balance in Lake Athabasca and the Delta, review of the hydrology and hydraulic program for the Delta, effects of Bennett Dam, strategies for water management in the North, etc. V.2 - Hydrological data contain tables of lake volumes, water levels, inflow and outflow, ice thickness, etc. V.3- Hydrological maps. 43- Peace-Athabasca watershed and Delta area, 1970, 26 x 43 cm. 44- Hydrometric network, 1971, 43 x 67 cm. 45- Ice thickness and depth of water study for winter ecology, 1971, 85 x 133 cm. 46- Locations of transects, river profiles,etc., 1972, 87 x 134 cm. 47- Limnological survey sample sites, 1971, 22 x 28 cm. 48- Graphs of river bed profiles and channel soundings..., 51 x 286 cm. All folded to fit 29 x 26 cm. envelope.