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.

Payment methods

Store description

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.

Specialty

Psychology, Mathematics, Hard Science, Signed, Astronomy, Physics, Antiquarian Books, Out of Print, First Editions

Seller's business information

Orca Knowledge Systems Inc.

2 Prestwick Ct.
Novato, CA U.S.A. 94949

Contact sellerView this seller's itemsView seller's storefront

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.

American Express, Visa, Mastercard and Discover cards accepted. 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.

Foreign orders: American Express, Visa and Mastercard accepted. Make sure name, address, phone number and book number appear on all correspondence. Indicate how you wish the book to be shipped. When paying by check write title and author on check. Also accept credit cards through PayPal.

Domestic Shipping: $3.85 Media Mail Rate or $5.25 for Priority Mail.

International shipping: $9 Global Priority to Canada or $7 surface to Canada. All other international rates: $12 Global Priority and $9 surface.

If unsure of shipping charges, please email your address and we can give you an exact shipping amount. No refunds for books lost in the mail. If this of concern to you, please add $1.50 to the shipping charge for insurance.

Right of withdrawal

If you are a consumer you can withdraw from the contract in accordance with the following. Consumer means any natural person who is acting for purposes which are outside his trade, business, craft or profession.

Information regarding the right of withdrawal

Statutory right to withdraw

You have the right to withdraw from this contract within 14 days without giving any reason.

The withdrawal period will expire after 14 days from the day on which you acquire, or a third party other than the carrier and indicated by you acquires, physical possession of the last good or the last lot or piece.

To exercise the right of withdrawal, electronically fill in and submit a clear statement on our website, under "My Purchases" in "My Account". We will communicate to you an acknowledgement of receipt of such a withdrawal on a durable medium (e.g. by e-mail) without delay.

To meet the withdrawal deadline, it is sufficient for you to send your communication concerning your exercise of the right of withdrawal before the withdrawal period has expired.

Effects of withdrawal

If you withdraw from this contract, we will reimburse to you all payments received from you, including the costs of delivery (except for the supplementary costs arising if you chose a type of delivery other than the least expensive type of standard delivery offered by us).

We may make a deduction from the reimbursement for loss in value of any goods supplied, if the loss is the result of unnecessary handling by you.

We will make the reimbursement without undue delay, and not later than 14 days after the day on which we are informed about your decision to withdraw from this contract.

We will make the reimbursement using the same means of payment as you used for the initial transaction, unless you have expressly agreed otherwise; in any event, you will not incur any fees as a result of such reimbursement.

We may withhold reimbursement until we have received the goods back, or you have supplied evidence of having sent back the goods, whichever is the earliest.

You shall send back the goods or hand them over to Orca Knowledge Systems, Inc., Novato, California, U.S.A., without undue delay and in any event not later than 14 days from the day on which you communicate your withdrawal from this contract to us. The deadline is met if you send back the goods before the period of 14 days has expired. You will have to bear the direct cost of returning the goods. You are only liable for any diminished value of the goods resulting from the handling other than what is necessary to establish the nature, characteristics and functioning of the goods.

Exceptions to the right of withdrawal

The right of withdrawal does not apply to:

The delivery of newspapers, journals or magazines with the exception of subscription contracts; and
The supply of digital content which is not supplied on a tangible medium (e.g. on a CD or DVD) if you accepted when you placed your order that we could start to deliver it, and that you could not withdraw once delivery had started.

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.