Here we offer as a 'package deal" the two published catalogs of the significant pewter holdings at the Yale University Art Gallery in New Haven, Conn.   The earlier 1965 volume, compiled by Graham Hood, includes a comprehensive selection of American items, many donated to Yale from the  Garvan collection ; the later, supplementary volume (1985) compiled by David L. Barquist, expands the scope to include new additions to the collection given by and in memory of Charles Montgomery as well as British wares and a good selection of more modern pewter   Both volumes are new, and in excellent condition.    59 pp. hardbound; 80 pp. softbound.