- Enter 16, 17, 18, 19 or 20 to return those published (by year) in that century
- For 17, 18 and 19 you can enter a third number to refine your search.
- Enter 183 to return all those published in the years 1830-1839
- Enter 0 to return biographical dictionaries where the date is unknown
(c) 2018. Frank Greene. All rights reserved.