These are files that are included on the CD-ROM and contain all explanatory information. In order to allow updates to the text, information on problems or improvements, and to provide additional instructions, the latest versions of the files are displayed here. These files should always supercede those on the CD-ROM. Check the dates on the files; note that the latest CD-ROM is dated September 1998. Updated files will be marked as such.
| README.V20 | introduction to USNO-A2.0 - should be read first. |
| README.V10 | introduction to version 1.0. |
| READMESA.V20 | extension of README needed for USNO-SA2.0. |
| READ.AST | USNO-A1.0 astrometry (no update for version 2.0). |
| READ.PHT | USNO-A1.0 photometry (no update for version 2.0). |
| READ.PMM | PMM design, hardware, and software (no update for version 2.0). |
| READUSE.V20 | how to read USNO-A2.0 and USNO-SA2.0 files. |
| DEMO.TAR | UNIX tar file containing FORTRAN and C source code for reading catalogs. |
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