Roy, W7EL wrote:
"The dipole Kraus is analyzing (as shown in his fig. 5-1 on page 127)
isn`t what we`d normally call an ordinary dipole."

Yes. Roy is right. On page 136, Kraus says:
"Let us now calculate the radiation resistance of the short dipole of
Fig. 5-1."

The dipole of Fig. 5-1 has its ends loaded with capacitive hats. The
result of the very short, in terms of wavelength, dipole and its
capacitive loading are to cause the same current throughout the dipole.
This is not the case in an ordinary dipole where current drops to near
zero at its ends.

My mistake was searching for numbers that would give an idea of how
radiation resistance varies as an antenna drops in length below resonant
length, and not reading the whole chapter.

As Roy says, on page 262 Kraus writes: When the length L is small,
(10-62) reduces very nearly to R11 = 5(beta L)squared ohms.

Best regards, Richard Harrison, KB5WZI