We specialize in the hard sciences and mathematics books including astronomy, physics, artificial intelligence, and more. Additional specialties would include psychology, history, business and management. All books are shipped using US Postal System. If you require some other method of shipping, please email us before purchasing.

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Seller's business information

Orca Knowledge Systems Inc.
2 Prestwick Ct., Novato, CA, 94949, U.S.A.

Sale & Shipping Terms

Terms of Sale

Money back guarantee if not satisfied with the transaction. Will hold the book for 10 days awaiting payment. Will ship FedEx. Please email for shipping charges.

Personal checks made payable to Orca Knowledge Systems Inc. Accept paper money orders. Accept Purchase Orders and will bill libraries and universities. Also accept credit cards through PayPal (contact us directly and I'll send you an invoice).

Foreign orders: American Express, Visa and Mastercard accepted. Make sure name, address, phone ...

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Shipping Terms

Orders usually ship within 2 business days. Shipping costs are based on books weighing 2 lbs, or 1 KG. If your book order is heavy or oversized, we may contact you to let you know extra shipping is required.

Shipping rates within U.S.A.

Shipping rates within U.S.A.
Order quantity	7 to 30 business days	3 to 6 business days
First item	US$ 5.75	US$ 8.75

Delivery times are set by sellers and vary by carrier and location. Orders passing through Customs may face delays and buyers are responsible for any associated duties or fees. Sellers may contact you regarding additional charges to cover any increased costs to ship your items.