Introduction:

You can use Google Scholar to see what someone was publishing about during a specific time frame. To do this, go to Google Scholar, select Advanced Search and enter the author's name in the "Return articles authored by$"$ field and the specific time frame in the "Return articles dated between" field. Use Google Scholar and the above$-$mentioned search fields to answer the question.

Question:

What was Dr$.$ Alley publishing about in $1989?($use RB Alley as the author's name$).$