1 Subjects: “...economic efficiency of industrial water use (ECEIW)...”

2 Subjects: “...efficiency...”

3 Subjects: “...energy efficiency improvement...”

4 Subjects: “...energy efficiency...”

5 Subjects: “...building energy efficiency...”

6 Subjects: “...street connectivity and efficiency...”

7 Subjects: “...street connectivity and efficiency...”

8 Subjects: “...efficiency...”

9 Subjects: “...sediment flushing efficiency...”

10 Subjects: “...water use efficiency...”

11 Subjects: “...nitrogen use efficiency...”

12 Subjects: “...energy efficiency...”

13 Subjects: “...technical efficiency...”

14 Subjects: “...efficient operation...”

15 Subjects: “...water use efficiency...”

16 Subjects: “...energy efficiency...”

17 Subjects: “...photosynthetic efficiency...”

18 Subjects: “...pump efficiency...”

19 Subjects: “...energy efficiency...”

20 Subjects: “...efficiency hypothesis...”