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Instruction guide.
Sound locator M2.

APA Citation

Sperry Gyroscope Company. (1940). Instruction guide: Sound locator M2. [Washington, D.C.: U.S. Govt. Print. Off..

MLA Citation

Sperry Gyroscope Company. Instruction Guide: Sound Locator M2. [Washington, D.C.: U.S. Govt. Print. Off., 1940.

Warning: These citations may not always be complete (especially for serials).