B5V

There are no B5V anchor standards

Garrison67 & Lesh68 list Rho Aur & Nu And as their B5V standards. 
Abt68 uses HD 36936 as their B5V standard. 
Hiltner69 lists Rho Aur = HD 34759 as its B5V standard.
Skiff08 flagged HD 34759 (MK73) and HD 36936 (MK78) as B5V standards. 
Cowley72 lists Nu And, Lam Cyg, & HR 5915 as their B5V standards.
MK43 and Garrison77 list Kap Hya as their B5V standard. 
Garrison79 lists 4 B5V standards: HD 145792, 147701, Rho Oph C & D.

<B-V>(B5V) = -0.157
<U-B>(B5V) = -0.560

For 6 primary and secondary standards,
<B-V>(B5V) = -0.157 (+-0.003 sem, +-0.007 stdev; N=6 standards)
<U-B>(B5V) = -0.560 (+-0.013 sem, +-0.028 stdev; N=6 standards)

# Primary Standards
HD 4727 = Nu And = HR 226 = BD+40_171
  B5V: JM53,Jaschek64(all),Lesh68(stan),Cowley72(stan),Jaschek78(JM53),Kennedy83,Garcia89,Hoffleit91
  B3: Cannon
  spectroscopic binary - F8 companion
  M91: V=4.530+-0.010, B-V=-0.149+-0.007, U-B=-0.577+-0.005
  =>QBV=> (B-V)o=-0.161, (U-B)o=-0.576, E(B-V)=0.012, T=15786

HD 14372 = HR 679
  B5V: JM53,Jaschek78(Lesh68),Guetter68,Garcia89
  B5: Cannon
  M91: V=6.100+-?, B-V=-0.080+-?, U-B=-0.480+-?
  =>QBV=> (B-V)o=-0.147, (U-B)o=-0.520, E(B-V)=0.067, T=14840

HD 34759 = Rho Aur = HR 1749
  B5V: MK73,Hiltner69(stan),Jaschek64(all but one),Jaschek78(Lesh68(stan)) 
  B5IV: Miczaika51
  B3: Cannon
  B3V: Garcia89
  M91: V=5.218+-0.004, B-V=-0.149+-0.009, U-B=-0.577+-0.008
  =>QBV=> (B-V)o=-0.161, (U-B)o=-0.576, E(B-V)=0.012, T=15786
  Hiltner69 uses Rho Aur as its B5V standard

HD 83754 = kap Hya = HR 3849
  B5V: MK43,Houk,Jaschek64(all but one),Garrison77(stan),Jaschek78(Morgan53),Garcia89,Buscombe65(B5Vn)
  B3/5IV/V: Houk88
  B3: Cannon
  I'm confused with the Houk88 class as I thought it was a Houk B5V standard?
  Kap Hya was the B5V standard in MK43. 
  M91: V=5.053+-0.010, B-V=-0.149+-0.018, U-B=-0.551+-0.015
  =>QBV=> (B-V)o=-0.153, (U-B)o=-0.545, E(B-V)=0.004, T=15254

HD 219688 = psi^2 Aql = HR 8858 
  B5V: Houk,Garcia89
  B5Vn: Jaschek78(Lesh68),Buscombe69
  B5: Cannon
  B7/8V: Houk99
  Jaschek64 has 2 B3V and 4 B5V
  Another Houk standard which has a different type in the MSS catalog(?)
  vsin= 340 km/s! 
  M91: V=4.393+-0.011, B-V=-0.150+-0.009, U-B=-0.551+-0.009
  =>QBV=> (B-V)o=-0.153, (U-B)o=-0.544, E(B-V)=0.003, T=15240

HD 36936 = Paranago 1664
  B5V: Abt68,MK78,Abt77,Jaschek78(Schild71),Garcia89,GrayAtlas
  B5: Sharpless52
  B3/5V: Houk99
  B7: Bernacca67
  B8: Cannon
  Walker69: V=7.590, B-V=-0.130, U-B=-0.550 
  =>QBV=> (B-V)=-0.157, (U-B)o=-0.560, E(B-V)=0.027, T=15510

HD 21278 = HR 1034 = Cl Melotte 20 774 (Alpha Per cluster)
  B5V: Jaschek64(all),Morgan71,Abt78,GrayAtlas
  B5: Cannon
  B4V: Lesh68
  B4: Petrie69
  B3V: Roman53
  B7: Heckmann56
  SB 
  M91: V=4.977+-0.005, B-V=-0.093+-0.008, U-B=-0.551+-0.007
  =>QBV=> (B-V)o=-0.165, (U-B)o=-0.592, E(B-V)=0.072, T=16093

# Secondary Standards
HD 4142 = HR 189
  B5V: Mikzaika51,JM53,Jaschek64(all),Jaschek78(Roman55),Garcia89,Hoffleit91
  B4V: Lesh68,Crawford71
  B3: Cannon
  SB. 

# Weak Standards
HD 198183 = lam Cyg = 54 Cyg = HR 7963
  B5V: JM53,Jaschek64(most),Meisel68,Cowley72(stan),Abt81,Slettebak82,Garcia89
  B6IV: Miczaika51,Lesh68
  B4V+B7V: Edwards76
  B5: Cannon
  Spectroscopic binary

HD 145792 = HIP 79530 = HR 6042 = V1051 Sco
  B5V: Slettebak68,Hiltner69,Jaschek78(Garrison67),Garrison79(stan)
  B6V: Morris61,Buscombe69
  B7IV: Bertiau58,Jaschek64(most)
  B6IV: Houk88(q=1)
  B8: Cannon
  Primary of 2" binary. SIMBAD calls alpha^2 CVn type star. Upper Sco member.  
  He-strong star. Given binarity and range of types, probably a Weak Standard.

HD 147701 
  B5V: Garrison67,Jaschek78(Garrison79(stan))
  B6V: Slettebak68
  B5III: Houk88
  B8: Cannon
  CCDM: 2.7" binary, V(A)=8.8, V(B)=13.6. Upper Sco member. Heavy E(B-V)?

HD 147933 = Rho Oph C
  B5V: Jaschek78(Garrison79(stan))
  B6V: Slettebak68
  B7V: Abt79,Abt83,Abt86
  B9n: Buscombe65
  B9V: Wilson52
  Cannon: A
  Upper Sco member. 

HD 147888 = HIP 80461 = Rho Oph D = 
  B5V: Jaschek78(Garrison79(stan)),Slettebak68,Buscombe65
  B3/4V: Houk88
  B3V: : Bertiau58,Feast57,Jaschek64(all),Cannon(B3),Abt86
  B4V: Buscombe69,Neubauer43(B4)
  0.5" binary. Upper Sco member. 

HD 142378 = HR 5915 
  B5V: Bertiau58(B5V:),Morris61,Jaschek64(all),Lesh68,Buscombe69,Cowley72(stan),Cannon(B5)
  B3V: Garrison67,Slettebak68
  B2/3V: Houk88
  SB, 0.7" binary. Upper Sco member. 
  Lesh & Cowley disagree by two types with Garrison & Houk.