Before there was an online AHS registration database one had to buy the printed versions of the registration information. It required many booklets to cover all the registered daylilies and there were printed updates, if not every year then every few years. The hybridizer name abbreviations were only in the booklets.
If you type the first few letters of a hybridizer's last name it will display all the registered cultivars that match. Typing in Fass will display all daylilies registered by Fass-P., Fass-Viette, Fass, Fass-Rasmussen and Wayman-Fass. The total is 138 daylilies. That is with the [Anywhere in Name] choice selected.
Typing in Fass with the [Beginning of Name] choice selected displays 137 registered daylilies - the one dropped is Wayman-Fass.
Typing in Fass with the [End of Name] choice selected displays just 12 records - only those for Fass
Typing in Fass-P. (with the period) with the [End of Name] choice displays 117 daylilies - only those for Fass-P.
Typing in Fass-P. or Fass-P (without the period) with the [Beginning of Name] choice selected displays 117 daylilies - only those for Fass-P
Typing in Fass- with the [Beginning of Name] choice selected displays 126 daylilies. Those are 117 for Fass-P, 8 for Fass-Viette, and 1 for Fass-Rasmussen
Typing in Fass-R with the [Beginning of Name] choice selected displays 1 daylily for Fass-Rasmussen
Typing in Fass-V with the [Beginning of Name] choice selected displays 8 daylilies for Fass-Viette
Typing in -Fass with the [End of Name] choice selected displays 1 daylily for Wayman-Fass
Sometimes it is better to type in less than the full name of a cultivar or a hybridizer (just the first few letters that may be unique to that cultivar or hybridizer) since one cannot be certain what punctuation was included in the name when it was registered and entered in the database and a search may require an exact match to what one types in the field.