On the web site pages you can see the icon
(put into the cart).
Clicking on it places a book on the list of selected ones for purchase.
The icon then changes its image to
(already in the cart). If you see this icon on
the page, it means that the the book has already been placed into the cart before. It is impossible to place into
the cart previously selected book.
If the icon looks like
(not for sale),
this means that the book is not available. If the page with
book detailed information
includes this icon "not for sale", then the description may or may not indicate the reason for its absence
(all run had been sold, for example).
But this only means that the book is not in stock, and it may be available for sale
in bookstores or online.
Pages with book sections include the hyperlink «See
selected books», to move to the page with selected books.
On that page, the number in parenthesis presents how many books you placed into the cart. Below you will
see the selected books in the form like on the pages with book sections. Near selected book title you can see
the icon .
If you click it, the book will be deleted from the list of purchase.
Clicking by hyperlink «Send email request»
you move to the page with the form
for sending your order by email. Email text includes all the books you put into the cart.
You can correct or add the text of this message (say changing the quantity of books you want to purchase).
Email is being sent after filling all fields and clicking Send
button at the bottom.
The contents of the cart with the selected books is stored while you are working with site pages.
The cart contents is erased after closing your browser.
PO Box 458, 17/8 Pirogova Lane, Saint Petersburg, 190000 Russia
(put into the cart).
Clicking on it places a book on the list of selected ones for purchase.
The icon then changes its image to
(already in the cart). If you see this icon on
the page, it means that the the book has already been placed into the cart before. It is impossible to place into
the cart previously selected book. 
(not for sale),
this means that the book is not available. If the page with
.
If you click it, the book will be deleted from the list of purchase. 