Columbia subject headings:
Harvard subject headings:
Asphalt--Additives
Asphalt--Congresses.
Kaplan, Elizabeth W.
Pavements, Asphalt--Congresses.
Pavements, Asphalt--Design and construction.
Pavements--Performance.
Road materials.
Princeton subject headings:
Asphalt materials--Congresses.
Pavements, Asphalt--Congresses.