A9V

There is no A9V anchor standard. HD 73450 is the best A9V candidate
standard that I can find.

GrayGarrison89 did not classify any stars as A9V. 

Morgan65 classified one Hyad as A9V: HD 27459. 

Cowley76 did not have an A9V standard, but classified three bright
stars as A9V: HR 3284 (A9V:), HR 4916 (A9V), HR 820 (A9V).

Gray01/03/06 listed zero A9V stars in their nearby star survey. 

# No standard
MK43,JM53, Morgan65, Cowley69, MK73, Cowley74,Cowley76, Houk, and 
Keenan85 do not provide an A9V standard

Skiff08 did not flag any stars as A9V MK standards. 

Looked for stars with multiple A9V entries in Skiff07 MK catalog:
HD 73450 (3 refs; V=8.5; del Scu), many with two A9V refs.

# Candidate Standard
HD 73450 = BD+20_2144 = Cl* NGC 2632 RG 328 (Praesepe member)
  A9V: Jaschek64(Bidelman56),Jaschek78(Bidelman56),Abt86,Gray02
  A7V: Kennedy83(Rebeirot66)
  A0: Cannon
  At least agreement between Bidelman/Abt/Gray.