This bibliography lists instructional materials for teaching adult learners of English as a Second Language (ESL). The resources listed are print materials made available through the Free Library of Philadelphia's Reader Development Program. All are on or below the eighth grade reading level, as determined with the Gunning Fog readability formula. The materials are listed by language skill area or topic (conversation, coping skills, listening, reading, pronunciation, writing, idioms and vocabulary, grammar, pre-vocational language, citizenship, activities and tutor materials). Entries include basic bibliographic data, reading level, a brief annotation, ESL instructional level, materials components available, series title, and price, when applicable. A title and series index, list of publishers and distributors and their addresses, branches of the Free Library of Philadelphia with telephone numbers, publications order form, and materials recommendation form are also included. (MSE) (Adjunct ERIC Clearinghouse on Literacy Education)