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Start Over You searched for: Catalog Issue Year Decade 1950 - 1959 Remove constraint Catalog Issue Year Decade: 1950 - 1959 Sudoc Stem I 29.21 Remove constraint Sudoc Stem: I 29.21

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71. Lava Beds National Monument, Calif.

72. Lehman Caves National Monument, Nev.

74. Montezuma Castle National Monument, Ariz.

76. Muir Woods National Monument, Calif.

77. Navajo National Monument, Tonalea, Ariz.

79. Oregon Caves National Monument, Oreg.

80. Organ Pipe Cactus National Monument, Ariz.