Appears to be the internal & comprehensive documentation for the building of the Kingston Dam (near Mellon's Rolling Rock) in Pennsylvania on the border of Derry & Ligonier. 

Identified J.G. White Engineering (NYC) this records the Latrobe Water Contract (1918-22). The album is built to be used, each photograph adhered only at one short edge so that the information on reverse could be easily viewed. This information is also often typed w/ dates. 

Unbound pages. Numbers are sequential but not complete, that appears to be from editing rather than loss. 

Mentioned are Booth & Flinn, Trout Run, Shoop Farm, Latrobe Club, Coal Pit Run, Loyalhanna Creek, Darlington and of course Kingston. Labor and excavation scenes with horse carts, steam and early gasoline shovels building the dam. 

3.25 x 5" (105); 3.25 x 10" folded panoramas (2); 5 x 7" (6) ; 8 x 10s (8).