q=many+of+which+illustrate+two+or+more+different+problems.+By+William+Beall+Gray.&searchType=standard&isFacet=true&view=standard&searchWay=author&rows=10&sortWay=score&sortOrder=desc&searchWay0=marc&logical0=AND
rows=10&searchWay0=marc&logical0=AND
many of which illustrate two or more different problems. By William Beall Gray.