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: "Irrigation -- Economic aspects -- Philippines -- Ilocos Norte" to "Irrigation efficiency -- Technological innovations" (Exclude extended shelves)
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- Irrigation -- Economic aspects -- Philippines -- Ilocos Norte (1 title)
- Irrigation -- Economic aspects -- South Dakota (1 title, plus subtopics)
- Irrigation -- Economic aspects -- Texas (1 title, plus subtopics)
- Irrigation -- Economic aspects -- Thailand, Northeastern (1 title)
- Irrigation -- Economic aspects -- United States (5 titles, plus subtopics)
- Irrigation -- Economic aspects -- United States -- Statistics (1 title)
- Irrigation -- Economic aspects -- Utah (1 title)
- Irrigation -- Economic aspects -- West (U.S.) (1 title, plus subtopics)
- Irrigation -- Economic aspects -- Wyoming (2 titles, plus subtopics)
- Irrigation -- Efficience (subtopics)
- Irrigation -- Efficience -- Californie (subtopics)
- Irrigation -- Efficience -- Californie -- San Joaquin, Vallée du (1 title)
- Irrigation efficiency (21 titles, plus subtopics)
- Irrigation efficiency -- Arizona (1 title)
- Irrigation efficiency -- California (3 titles, plus subtopics)
- Irrigation efficiency -- California -- San Joaquin Valley (2 titles)
- Irrigation efficiency -- Colorado (1 title)
- Irrigation efficiency -- Economic aspects (subtopics)
- Irrigation efficiency -- Economic aspects -- California (2 titles)
- Irrigation efficiency -- Economic aspects -- United States (1 title, plus subtopics)
- Irrigation efficiency -- Kansas (1 title)
- Irrigation efficiency -- Measurement (subtopics)
- Irrigation efficiency -- Measurement -- Instruments (1 title)
- Irrigation efficiency -- North Dakota (1 title)
- Irrigation efficiency -- Technological innovations (1 title, plus subtopics)
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