These subscriptions begin with the next issue after your order has been processed.
Irregular subscriptions have no fixed date of issuance.
These subscriptions begin with the next issue after your order has been processed. Basic manuals with supplements begin with the issuance of the basic material and continue with subsequent supplements. Entries for this type of subscription are marked by . Subscriptions are for one year, unless otherwise noted. Back issues of dated periodicals and irregular subscriptions often are available for purchase.