HYDROCHEMISTRY OF THE UPPER ORANGE RIVER CATCHMENT

REFERENCES

• AMERICAN PUBLIC HEALTH ASSOCIATION . 1964 . Standard methods for the examination of water and wastewater New York : APHA .
   Google Scholar
• BRUCE , R. W. and KRüGER , G. P. 1970 . Die algemene geo-logie en geomorfologie van die bo-Oranjeopvangs-gebied geleë in die Hoëveldstreek, met spesiale verwysing na die invloed daarvan op gronderosie, Internal Report Potchefstroom : Research Institute of the High-veld Region .
   Google Scholar
• CONWAY , E. J. 1942 . Mean geological data in relation to oceanic evolution. . Royal Irish Acad. Proc. B , 48 : 119 – 159 .
   Google Scholar
• DEPARTMENT OF WATER AFFAIRS . 1964 . Hydrographic survey publication No 8, Volume 1 Pretoria : The Government Printer .
   Google Scholar
• DU TOIT , A. L. 1904 . Geological survey of the divisions of Aliwal North, Herschel, Barkly East and part of Woodhouse Geol. Coram. Cape of Good Hope, , Cape Town : Ninth Ann. Rep .
   Google Scholar
• GEOLOGICAL SURVEY . 1955 . Geological map of South Africa. Scale 1: 1000 000 Pretoria : Government Printer .
   Google Scholar
• HEMENS , J. , SIMPSON , D. E. and WARWICK , R. J. 1977 . Nitrogen and phosphorus input to the Midmar Dam, Natal. . Water SA , 3 : 193 – 201 .
   Google Scholar
• ROOSEBOOM , A. 1978 . Sedimentafvoer in Suider-Afrikaanse riviere. . Water SA , 4 : 14 – 17 .
   Google Scholar
• SCHMID , G. 1968 . Über das ideale Ca: Mg-Verhältnis der Ackerboden. . Landwirtsch. Forsch. , 21 : 222 – 230 .
   Google Scholar
• STARY , J. 1964 . The solvent extraction of metal chelates New York : MacMillan .
   Google Scholar
• STEGMANN , P. 1975 . Preliminary physico-chemical and primary productivity studies of the Hendrik Verwoerd Dam Bloemfontein : University of the Orange Free State . M.Sc. thesis
   Google Scholar
• STOCKLEY , G. M. 1947 . Report on the geology of Basutoland Maseru : Controller of Stores .
   Google Scholar
• THERON , J. C. 1970 . Some geological aspects of the Beaufort Series in the Orange Free State Bloemfontein : University of the Orange Free State . D.Sc. thesis
   Google Scholar
• TOERIEN , D. F. , HYMAN , K. L. and BRUWER , M. J. 1975 . A preliminary trophic status classification of some South African impoundments. . Water SA , 1 : 15 – 23 .
   Google Scholar
• TOERIEN , D. F. and WALMSLEY , R. D. 1978 . The dissolved mineral composition of the water flowing into and out of the Hartbeespoort Dam. . Water SA , 4 : 25 – 38 .
   Web of Science ®Google Scholar
• U.S. DEPARTMENT OF AGRICULTURE . 1954 . Diagnosis and improvement of saline and alkali soils , Agricultural Handbook No 60.
   Google Scholar
• VISSER , D. L.J. and VAN RIET LOWE . 1955 . Die geologie en argeologie van die Klein Caledonriviervallei , Geol. Opn. Mem. No 47 Pretoria : Goevernment Printer .
   Google Scholar
• VISSER , J. N.J. 1964 . Analysis of rocks, minerals and ores Pretoria : Government Printer .
   Google Scholar
• VOLLENWEIDER , R. A. 1972 . Input-output models. With special reference to the phosphorus loading concept in limnology. Conference on chemical-ecological considerations for defining the goal of water pollution control Switzerland : Kastanienbaum .
   Google Scholar
• WALMSLEY , R. D. and TOERIEN , D. F. 1978 . The chemical composition of the waters flowing into Roodeplaat Dam. . Water SA , 4 : 192 – 202 .
   Web of Science ®Google Scholar
• WALMSLEY , R. D. , TOERIEN , D. F. and STEŸN , D. J. 1978 . Eutrophication of four Transvaal Dams. . Water SA , 4 : 61 – 75 .
   Web of Science ®Google Scholar
• WETZEL , R. G. 1975 . Limnology Philadelphia : W.B. Saunders .
   Google Scholar