Research paper RP1787-RP1788, RP1791-RP1795, RP1797, RP1799-RP1800, RP 1803, RP1805-RP1806. RP1806. Relative thickness of lead, concrete, and steel required for protection against narrow beams of X-rays [with list of references]; by George Singer, Harold O. Wyckoff, and Frank H. Day.

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