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## Acknowledgments

This work was supported in part by the Advanced Research Projects Agency under contract number DABT63-93-C-0052. Danzig was also supported in part by the Air Force Office of Scientific Research under Award Number F49620-93-1-0082, and by a grant from Hughes Aircraft Company under NASA EOSDIS project subcontract number ECS-00009, and by National Science Foundation Institutional Infrastructure Grant Number CDA-921632. Schwartz was also supported in part by the National Science Foundation under grant numbers NCR-9105372 and NCR-9204853, an equipment grant from Sun Microsystems' Collaborative Research Program, and from the University of Colorado's Office of the Vice Chancellor for Academic Affairs. Chuck Neerdaels was supported by HBP NIH grant 1-P20-MH/DA52194-01A1.

The information contained in this paper does not necessarily reflect the position or the policy of the U.S. Government or other sponsors of this research. No official endorsement should be inferred.

We thank John Noll for writing the initial cache prototype. We thank Darren Hardy, Erhyuan Tsai, and Duane Wessels for all of the work they have done on integrating the cache into the overall Harvest system.