First, thanks for posting the catalogue. I've got 4 1992 DBs. Two 1992 Ascent EXs in deep purple, a Topanga in white w/ black spangle and a Sorrento in black w/ white spangle. The decals on the Ascent EXs state 100% AVR Double Butted ChroMo steel. The Topanga and Sorrento just AVR Double Butted ChroMo main tubes. Everything lines up perfectly component-wise except the Sorrento fork is tapered and 1" instead of the 1 1/8" on the others.

EDIT: The Topanga states 100% AVR Double Butted ChroMo as well. The forks on all 4 bikes state AVR ChroMo as well.