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 three tenses are used, and they distinguish aspect only, not time: The optative mood likewise uses these three tenses, but there is also a future optative, used mainly to report indirectly what would be a future indicative in direct speech. Ancient Greek has no perfect progressive or past perfect progressive. Thus, the meaning "he has been doing" is typically expressed with the present tense, and "he had been doing (earlier)" is expressed with the imperfect tense: For further information on the endings, see Ancient Greek grammar (tables). Dictionaries of Ancient Greek usually give six principal parts for any verb. For