The National Archive’s delightful quarterly, Prologue, is now available as an electronic publication. You will find it at Scribd and at Zinio. Zinio, a gorgeous platform (and iPad app) for reading a growing number of magazines, offers both subscriptions and the ability to purchase back issues. At Scribd you can purchase complete issues as well as individual articles. Not only do both platforms maintain the look and feel of the print edition, they’re a lot easier to store and retrieve.