Why is no income variable (other than income quartile info.) available for 1985 in AHTUS data?

Can this information be gleaned elsewhere? I am also trying to discern which income amounts correspond to the 1985 income quartiles.

The WAGELM is available in the 1985 sample, but is missing some detail available in other income variables, as it only reports income earned from wages. Unfortunately there is little else available for identifying income in the 1985 AHTUS sample.