Columbia subject headings:
Nondestructive testing.
Roofing--Testing.
Roofs--Moisture--Measurement.
Harvard subject headings:
Moisture--Measurement
Nondestructive testing.
Roofing--Testing.
Roofs--Moisture--Measurement.
Roofs.
Princeton subject headings:
Nondestructive testing.
Roofing--Testing.
Roofs--Moisture--Measurement.