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<br /> <br />OJ2~37 <br /> <br />. <br /> <br />u. S. Geological Survey <br /> <br />a. "Phreatophyt;e Research in the Western States March <br />1959 to July 1964", by T. W. Robinson, Circular 495, <br />Deaember 1964. <br /> <br />.i- <br /> <br />b. "Introduation, Spread. and Areal Extent of Saltcedar <br />(Tamarix) in the Western States", by T. W. Robinson, <br />Professional Paper 491-A, June 1965. <br /> <br />3. Continuing Projects <br /> <br />a. Task Force on Plant Succession: Chairman J. S. Horton. <br /> <br />Before and after aerial photographs of phreatophyt;e <br />areas, showing ahanges in cover density and species over <br />a period of years continue to be received, catalogued <br />and filed in Phreatophyte Library, Arizona State University, <br />Tempe, Arizona. <br /> <br />.. <br /> <br />b. Library Task Force. Chainnan J. S. Horton. <br /> <br />. <br /> <br />All publiaations in the Phreatophyte Library at <br />Arizona State university have been card :l.ndexed and the <br />cards checked. From the cards a new list of publications <br />is being prepared for duplication. This will replace the <br />list of August la, 1960, which, is incomplete and out of <br />date. <br /> <br />c. Task Force on Research and Coordination. Chairman <br />T. W. Robinson. <br /> <br />Upon request from the U. S. Information Agency <br />prov.l.ded photographs and material on the phreatophyt;e <br />problem for a feature article by the U. S. Information <br />Service. <br /> <br />". <br /> <br />Two publications dealing with vegetation mapping <br />were reviewed for the benefit of the SubcOllllllittee. One <br />dealt with Soil-Vegetation maps and T:l.mber Stand-Vegetation <br />maps of the native and naturalized vegetation, in the <br />uncultivated mountain and foothill land in California, by <br />the U. S. Forest Service. Areas of phreatophyt;e growth <br />are easy to loaate on the maps. <br /> <br />.., <br /> <br />The other report "Grassland Restoration _ The Texas <br />Brush Problem", by the Soil Conservation Service, describes <br />16 1Ill;portant brush species, and gives their acreage in three <br />density classes of light, medium and thick. Mesquite is <br />listed as occurring on 56 million acres of which 16 million <br />aares is thick growth. The report does not state whether <br />mesquite occurs as a phreatophyt;e, but there must be a <br /> <br />. <br /> <br />-9- <br /> <br />