21 Subjects: “...phase change material cooling...”

22 Subjects: “...raw material...”

23 Subjects: “...native plant material...”

24 Subjects: “...manual materials handling...”

25 Subjects: “...,Bookselling,Bookbinding,Margaret Bingham Stillwell,Material culture,Family expense,Woodcuts,Reformation,Bonus...”

26 Subjects: “...,Production,Research methodology (in Byzantine legal studies),History of Byzantine law,Material culture...”

27 Subjects: “...piezoelectric material...”

28 Subjects: “...piezoelectric material...”

29 Subjects: “...piezoelectric material...”