Beardsley, J. (1977). Probing the earth: Contemporary land projects ; Hirshhorn Museum and Sculpture Garden, Oct. 27, 1977 - Jan. 2, 1978 ; LaJolla Museum of Contemporary Art, Jan. 27 - Febr. 26, 1978 ; Seattle Art Museum, March 23 - May 21, 1978 / introd. and text by John Beardsley. Smithsonian Inst. Pr..

Beardsley, John. Probing the Earth: Contemporary Land Projects ; Hirshhorn Museum and Sculpture Garden, Oct. 27, 1977 - Jan. 2, 1978 ; LaJolla Museum of Contemporary Art, Jan. 27 - Febr. 26, 1978 ; Seattle Art Museum, March 23 - May 21, 1978 / Introd. and Text by John Beardsley. Washington: Smithsonian Inst. Pr., 1977.

Beardsley, John. Probing the Earth: Contemporary Land Projects ; Hirshhorn Museum and Sculpture Garden, Oct. 27, 1977 - Jan. 2, 1978 ; LaJolla Museum of Contemporary Art, Jan. 27 - Febr. 26, 1978 ; Seattle Art Museum, March 23 - May 21, 1978 / Introd. and Text by John Beardsley. Smithsonian Inst. Pr., 1977.