@book{7750,
	author = {Mayr, Otto.},
	title = {Feedback mechanisms in the historical collections of the National Museum of History and Technology.},
	publisher = {Smithsonian Institution Press; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.]},
	year = {1971.},
	series = {Smithsonian studies in history and technology, no. 12},
	address = {Washington}
}