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AbstractThis article introduces the Native American Graves Protection and Repatriation Act of 1990 (NAGPRA)
and outlines basic compliance procedures for most federal agency land managers. NAGPRA is actually civil rights
law, but federal cultural or natural resource managers generally are assigned responsibility for NAGPRA compliance
within affected agencies. The Act deals only with "NAGPRA objects," defined in NAGPRA as Native
American human remains, funerary objects, sacred objects, and objects of cultural patrimony. NAGPRA has three
basic parts. The first deals with collections under federal control or in museums prior to 1990. The second deals
with intentional removal or inadvertent discovery of NAGPRA objects. The third deals with criminal penalties for
illegal trafficking in NAGPRA objects. This article addresses only the first two parts, with the primary focus on
the second part; that is, processes required and recommended for intentional removal and inadvertent
discovery of NAGPRA objects on federal lands. © 2003 Wiley Periodicals, Inc.

Recognition thresholds for lunar crater size were determined, analytically, for various look angles and magnifications, at an orbital altitude of 80 nautical miles. Elliptical image measurements for various sized craters were combined with some previous threshold recognition data for the ellipse (Casperson, 1950). Elliptical image measurements consisted of the visual angle of the major axis, and elliptical form (the ratio of minor axis to major axis). A computer program was generated from which the visual angle and form measurements of anticipated elliptical crater images were computed for various combinations of crater size, look angle, and magnification. Casperson's data was then re-worked to obtain the visual angle and form measurements associated with his recognition threshold data for the ellipse. By graphically combining the visual angle and form data from both computations, 50% and 75% threshold recognition curves were generated, relating crater size, magnification and look angle. Implications of these data are discussed.