Section Ω. Springhouse and water channel ... D.B ... Dirty Cartridge Paper Drafting Ink ... 1957
Section Ω. Section of water channel at 55 ΝΣ' ... D.B ... Dirty Cartridge Paper Drafting Ink ... 1957
Plan, section, and isometric of north-south Water-channel in section O ... Marian R. Holland ... Dirty Cartridge Paper Drafting Ink ... 1952
Isometric drawing of the Great Drain west of Eponymous Heroes ... W.B. Dinsmoor, Jr ... 87-533 87-533 Dirty Heavy Tracing Paper Drafting Ink ... 1974
