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Underground Houses: How to Build a - Paperback, by Roy Robert L. - Acceptable

HOW TO BUILD LOG-END HOUSES BY ROBERT ROY ILLUSTRATED DON JERRY HARDCOVER

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HOW TO BUILD LOG-END HOUSES BY ROBERT ROY.

1979 Underground Houses: How to Build a Low-Cost Home Robert L. Roy Paperback

In the Enemy's Camp by Roy Thomas and Robert Louis Stevenson (2009, Hardcover)