Public domain
Bureau of Standards making extensive tests of glass building blocks. Washington, D.C., June 20. Hollow glass building blocks are being used more and more extensively for structural purposes when both greater light distribution and air conditioning are required. Extensive tests to determine the stren
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineBureau of Standards making extensive tests of glass building blocks. Washington, D.C., June 20. Hollow glass building blocks are being used more and more extensively for structural purposes when both . 1938-01-01. Harris & Ewing. Harris & Ewing Collection, Library of Congress. Public domain.
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