Text, illustrations, and exercises are used in these two learning modules to familiarize allied health students with the use of periodical indexes and the Library of Congress (LC) subject headings. The first module identifies the purpose of periodical indexes, distinguishes between indexes to periodical magazines and scholarly journals, reviews the parts of an index citation, and requires the student to find three articles on a specific health topic in one or more appropriate periodical indexes. The second module teaches the student to conduct subject searches with LC subject headings. This module describes the main subject heading, LC classification numbers which accompany the headings, "see" references, "see also" references, subheadings, and other syndetic features of the LC headings. Each of the modules provides reinforcement exercises with immediate feedback and concludes with a post-test and answer sheet. The first module requires 20 minutes and the second 30 minutes to complete. (JP)