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Tube Substitution Handbook 18th Edition 1974 http://ping.fm/xrWqF

Vacuum Tube Substitution Handbook 18th Edition 1974 by Howard W Sams and Co Inc. The outer front cover has some bends and the top right pages of the book have a slight fold, the 96 pages of substitutions are very clear and readable. There are 7 Sections – Substitutions for: American Receiving Tubes, Picture Tubes, Sub-miniature Tubes, Industrial Tubes, Communications and Special Purpose Tubes, Foreign Substitutes for American Types, American Substitutes for Foreign Types.
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What is an Owl ?

The Owls (Strigiformes) are birds of prey, comprising of over 200 species. Most are solitary, and nocturnal, with some exceptions (Burrowing Owl). Owls mostly hunt small mammals, insects, and other birds, though a few species specialize in hunting fish. They are found in all regions of the Earth except Antarctica, most of Greenland, and some remote islands. Though owls are typically solitary, the literary collective noun for a group of owls is a parliament. The living owls are divided into two families, the typical owls, Strigidae, and the barn-owls, Tytonidae.