Goodman, Richard E.
Introduction to rock mechanics
John Wiley & Sons, 1980
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Pusch, R.
Rock mechanics on a geological base
Elsevier, 1995
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Schenk, George
How to plan, establish and maintain rock gardens
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Whistley, David S
Introduction to rock art research
Left Coast Press, inc., 2005
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Whitley, David S.
Introduction to rock art research
California Left Coast Press, 2011
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