1 Subjects: “...abbasid period...”

2 Subjects: “...modern period...”

3 Subjects: “...periodical grids...”

4 Subjects: “...cooling period...”

5 Subjects: “...active period...”

6 Subjects: “...curing periods...”

7 Subjects: “...Middle Woodland period...”

8 Subjects: “...controlled periodic illumination...”

9 Subjects: “...management period...”

10 Subjects: “...management period...”