Sampling soil plots

[1] BEAR FE, 1916, W VA AGR EXP STA B, V160, P13

[2] HOPKINS CG, 1911, 150 ILL AGR EXP STA, P1

[3] The sampling of soils [J]. JOURNAL OF THE CHEMICAL SOCIETY, 1902, 81 : 883 - 887

[4] *OFF AGR CHEM, 1916, J ASS OFF AGR CHEM, V1, P11

[5] PFEIFFER TL, 1912, LAND VERS STAT, V78, P367

[6] ROBINSON GW, 1915, J AGR SCI, V7, P114

[7] THIEL R, 1905, MITT LANDW I BRESLAU, V3, P157

[8] WARINGTON R, 1895, USDA OFF EXP STA B, V8, P7

[9] WHITNEY M, 1899, USDA BUR SOILS B, V16, P14

[10] WILEY HW, 1895, PRINCIPLES PRACTICE, V1, P61

[1] BEAR FE, 1916, W VA AGR EXP STA B, V160, P13

[2] HOPKINS CG, 1911, 150 ILL AGR EXP STA, P1

[3] The sampling of soils [J]. JOURNAL OF THE CHEMICAL SOCIETY, 1902, 81 : 883 - 887

[4] *OFF AGR CHEM, 1916, J ASS OFF AGR CHEM, V1, P11

[5] PFEIFFER TL, 1912, LAND VERS STAT, V78, P367

[6] ROBINSON GW, 1915, J AGR SCI, V7, P114

[7] THIEL R, 1905, MITT LANDW I BRESLAU, V3, P157

[8] WARINGTON R, 1895, USDA OFF EXP STA B, V8, P7

[9] WHITNEY M, 1899, USDA BUR SOILS B, V16, P14

[10] WILEY HW, 1895, PRINCIPLES PRACTICE, V1, P61