ABC-CLIO in 1969: ABC stands for American Bibliographical Center and CLIO Press is named after Clio, the muse of history from ancient Greek mythology. According to Boehm, he had always been interested in history so when he noticed that there were not many good historical abstracting services available, he started publishing the "Historical Abstracts". During the 1960s, a sister bibliographic and abstract publication on American history was added, "America: History and Life", which was considered an award-winning title. The company entered into digital publishing with electronic data in the 1960s and in 1975, it published its first online database called "DIALOG".
Ancient Greek verbs "I ate"; and in the middle voice () "I became" and () "I arrived". Many verbs have an aorist without the sigma markers and characteristic endings of the regular aorist. Typically these verbs have present progressive markers added to the stem in the present system, so that the basic stem is used in the aorist and in the other aspects. One example is the verb (), "I go", which becomes (). However, by no means all Ancient Greek verbs are so regular in their principal parts as (). For example, the verb () "I take" has the following parts: As