[Ephemera] Earth Art: Walter de Maria, Smithson and Morris (1) Walter de Maria, six cards. Includes an invitation card from Galleria Sperone in 1970 for the film 'Hard Core, 1969'; Card for The New York Earth Room (1977); Preview card and brochure for The Lightning Field by Dia Art Foundation New York; Folding card by Heiner Friedrich for a Walter de Maria show Oct. 1- Nov. 5 1977 and 'Equal Area Series' at the Lone Star Foundation (precursor to Dia Art Foundation), New York. (2) Three Smithson cards including an invitation for a show at Kröller-Müller in Otterlo in 1977. (3) Robert Morris, promotional flyer for a lithography edition titled 'Earth Projects', 1969. (total 10)

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