The Engineer Grapples with Nonlinear Problems

1. All items are guaranteed to be fully described as to condition, with defects noted. Items are returnable for any reason within 30 days of receipt, or later by mutual agreement; for returned items, prior telephone or e-mail notice is required, as well as proper packing and, if appropriate, insurance. When items are found to not be as described, we will pay reasonable return shipping costs from the country to which we originally sent the item or, if returned from the US, the actual return postage amount..
2. Prices are net; payment is due prior to shipment; we accept U. S. checks or money orders, or electronic transfers through Internet payment providers such as Paypal; we do not have facilities for direct credit card payments. International postal money orders accepted; international bank checks must be drawn on banks with U.S. addresses and routing numbers. Direct bank transfers are accepted for orders over $2500 if requested.
3. All items subject to prior sale.
4. Purchases delivered to addresses in California are subject to an additional 9.5% sales tax.
5. E-mail to arroyosecobooks@earthlink.net is the best way to contact us to inquire about or to order books.

Postage, handling and insurance are extra, at estimated cost and processing fee. Shipment at standard rates is for small to standard sized books via media mail within U.S., or via Priority Mail envelope overseas, with tracking. Standard shipping costs are based on books of standard size with shipping weight of 4 pounds or less; if a book order is heavier or oversized, extra shipping costs may be charged. Non-standard and higher-valued international shipments are charged estimated postage and shipping costs, including full insurance for all shipments valued over $200. The full purchase price is always indicated on the Customs statement.