Recent studies provide little evidence to support the idea that there is a crisis in access to the scholarly literature. Further research is needed to investigate whether free access is making a difference in non-research contexts and to better understand the dissemination of scientific literature through peer-to-peer networks and other informal mechanisms.

This bibliography summarizes the most important recent literature on elderly migration and retirement migration in the U.S. and Canada, providing an interdisciplinary review of articles published between January 1990 and December 2000. It describes and evaluates 232 studies dealing with migration theory and methods, the determinants of later-life mobility, patterns of migration, destination choice, consequences of migration, local and regional development, seasonal migration, return migration, and related topics. WILLIAM H. WALTERS, Ph.D., is collection development coordinator and acquisitions librarian in the Owen D. Young Library at St. Lawrence University.

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This article examines the impact of origin and destination characteristics on the internal migration of retired migrant groups that have been defined on the basis of their life-course attributes. Separate regression analyses of in-migration, out-migration, and local mobility were conducted for each of three groups: amenity migrants, assistance migrants, and severely disabled migrants not living with a spouse. The results are generally consistent with the life-course model of migration. Amenity migrants are strongly attracted by pleasant climates and favorable economic conditions but tend to avoid large metropolitan areas. Assistance migrants, notable for their tendency to live in low-cost housing, do not choose the counties or metropolitan areas with the lowest average rents but appear to select low-cost housing within particular areas after choosing those areas on the basis of other criteria. Migrants with severe disabilities are especially likely to leave those places where nursing home facilities are inadequate.Two conceptual frameworks, the push-pull model and the life-course approach, have guided recent research on later-life migration. The push-pull model states that migrants move in response to attractive and unattractive characteristics at their places of origin and destination. 1 Desirable place characteristics encourage in-migration and discourage out-migration, while undesirable characteristics encourage out-migration and discourage in-migration. Perhaps because the pushpull model is relatively easy to operationalize and interpret, it has been used in virtually all recent studies that investigate the impact of place characteristics on later-life mobility. As a model of group behavior, the push-pull model is based on the assumption that all persons within

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