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Data with a horizontal resolution of better than 500 m are publicly available for only 10 percent of the global land surface . In some cases , as many as 68 % of these children are engaged in hazardous work . She has also recorded many albums - - encompassing a variety of styles , including pop , rock , country , and show tunes - - that have earned her two silver discs . Described by one critic as " one of the greatest writers of our time , " Oates is the author of many distinguished books in several genres . Rogowski ( 1972 ) found that over a range of soils that the coefficient of variation in the distribution of water content at 15 bars was in the range of 15 to 35 % ; and for experimental hydraulic conductivity was 5 to 68 % . Grism ( grating on prism ) and grens ( grating on lens ) designs for field spectroscopy have been explored at dispersions of 20 A / pixel and 40 A / pixel and are reported in Appendix 5 The use of a grism in the filter wheel , which is operationally attractive since it offers the potential for stable corrector opto-mechanics , appears not to be viable since image quality suffers badly and grism wedge angles are sufficiently high that grism edge thicknesses ( up to 45 mm ) greatly exceed the space available in the filter assembly .