BERGSMA, E. Aerial photo-interpretation for soil erosion and conservation survey part I: Soil erosion features.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBERGSMA, E. Aerial Photo-interpretation for Soil Erosion and Conservation Survey Part I: Soil Erosion Features.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBERGSMA, E. Aerial Photo-interpretation for Soil Erosion and Conservation Survey Part I: Soil Erosion Features.
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