Any of the programs may be downloaded free of charge. To do this, go to the descriptive page for each program by clicking on its entry on the Contents Page, or the In Progress page and find the download link near the bottom of the page. The downloaded file will be a ZIP archive containing the original source code, the current source code, input description (if available), test cases (if available) and any additional descriptive material. The available non-copyrighted references may be dowloaded from the reference page associated with each program. Instructions are included for compiling the source code using the free gfortran compiler from the GNU compiler collection.
Some people may prefer to have the complete collection of programs, instructions, test cases, references, and executables on one convenient compact disc. I will continue to make such a disc available for a nominal charge of $99 US, postpaid. You may order a disc by mail by sending cash, check or money order to PDAS, PO Box 1438, Santa Cruz CA 95061 USA. If you wish to pay by PayPal, Visa, American Express or MasterCard, you may place an order via the PDAS Store. This is a secure web site that enables me to fill your order safely and rapidly. For the next month or so, I will process credit cards, but I plan to move all money transactions to PayPal before the end of 2011.