The files in the directories below have been archived with the UNIX "tar" command, compressed with the "compress" command, and chopped into pieces no larger than 100,000 bytes. (The chopping is done because some systems do not allow ftp transfer of files larger than approximately 100Kb.) To reconstitute the compressed tar file, simply concatenate all the files in the directory into one "tarfile." Under UNIX, this can be accomplished with the following command: cat *part* > XXX.tar.Z Where "XXX" is the name of the tarfile. (This name should be obvious from the names of the chopped files.) Then the file may be uncompressed with: uncompress XXX.tar.Z And un-tar-ed with: tar xvf XXX.tar After un-tar-ing the files, you should see a new directory called "HDF3.2r1" under your current directory. If you "cd" into that directory, there is a README.FIRST and an INSTALL.TOP file to direct you in building the HDF library and, if you like, the HDF utilities and test programs.