The basic characteristics of sixty-nine secondary services in physics were analyzed in terms of sponsorship and distribution by: (1) country of origin, (2) language, (3) age, (4) frequency of publication, (5) subject and geographical coverage and (6) size. The eight major services, in terms of size, are identified. The use of the services by the physics community was not determined. This is a part of the American Institute of Physics to determine the size, scope and sources of physics literature in all its forms for the purpose of developing a national physics information system. (Author/NH)