This bibliography has been compiled to alert educators to documents about concept development in young children, particularly the development of number concepts found in the ERIC microfiche collection and in journal literature. Abstracts of selected documents were taken from "Research in Education (RIE)" and journal article citations from the "Current Index to Journals in Education (CIJE)". Included are published and unpublished studies focusing on children's acquisition of concept of number, number conservation research, suggestions for practitioners relating to number development, and concept research. Descriptors (subject terms used to characterize the entries) appear after each title and will help the users of this bibliography to identify topics covered in the selections. (Author/WY)