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In the projects fostered by the NRP the effects of changed climate (atmospheric CO2 concentration, temperature) on different terrestrial ecosystems were studied. For forests it was concluded that the initial stimulation of tree growth in general did not persist after two years, and therefore care must be taken not to overestimate the potential contribution of increased carbon sequestration by forests. On the other hand, shifted patterns of carbon distribution in the tree-soil system may lead to a higher soil organic matter content, which will contribute to an improved soil structure and availability of soil moisture. A sensitivity analysis revealed that, for the poor sandy forest soils, improved rooting depth is...
In an earlier article the author has argued that the turbulent history of nuclear power in Britain and the USA stems from the technology itself, and has little to do with the very different institutional arrangements made for the new technology in the two countries. Nuclear plant has various features which make its planning extraordinarily difficult. Its long lead time, large unit size, capital intensity and dependence on complex infrastructure combine to ensure that mistakes are likely to be made in planning the technology and that what mistakes do occur are expensive. This article aims to expand on the earlier one in two ways; by looking at the apparent success of the French nuclear programme which seems to run...
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Album caption: Complete multiplex mapping unit showing portion of compiled map. Photograph taken by E.F. Patterson, August 1952. Negatives on file in Central Region. No index card.
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Album caption: Long multiplex bar with Zeiss wide angle projectors. For use in stereo-triangulation. Photograph taken by E.F. Patterson, August 1952. Negatives on file in Central Region. No index card.
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Album caption: H&H multiplex supporting frame with equipment. Photograph taken by E.F. Patterson, August 1952. Negatives on file in Central Region. No index card.
The major part of the Netherlands consists of a low-lying river delta which is very sensitive to hydrological conditions in the North-Western part of the European continent. The rivers Rhine, Meuse and Scheldt carry through this delta to the North Sea annually nearly 100 km3 of fresh water. This water originates from a drainage basin of about 185 000 km2, which is 6 times the country area. The present geography of the Netherlands has largely been shaped by this river inflow and by the sediments which are carried along. Interaction of these fluxes with North Sea hydrodynamics in a period of rising sea level has produced large lowlands, which in the past millennium have been reclaimed for agricultural, urban and industrial...
Evidence from cross-sectional growth regressions suggests that economies dependent on natural resource exports have had slower growth than resource scarce economies. Explanations for this "curse of resources" focus on institutional and market failures caused by resource abundance. With a simple two sector model exhaustible resource model, we demonstrate that the correlation between growth and natural resource abundance can be negative in the absence of market and institutional failures. Since there is no way to distinguish between efficient and inefficient equilibria on the basis of the negative correlation between growth and resource abundance, finding that correlation is not sufficient to conclude resources are...
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Album caption: The multiplex stereoplotting instrument is especially advantageous in that interpretation, measuring, and plotting of geologic data can be carried out in one continuous operation. ca. 1956. No index card. Published as figure II in U.S. Geological Survey. Bulletin 1043-A. 1956.
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Album caption: The Kelsh plotter, which uses a projected model scale about 5x that of the original photography, giving the interpreter a great advantage in interpreting geologic data as well as positioning such data on the base map. As with the multiplex, interpreting, measuring, and plotting geologic data can be done in one continuous operation. ca. 1956. No index card. Published as figure 12 in U.S. Geological Survey. Bulletin 1043-A. 1956.
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Album caption: The Hugershoff Aerocartograph. n.d. No index card.
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Album caption and index card: Twinplex stereoscopic plotter for transverse and convergent photography. Photogrammetry, Topographic Division, U.S. Geological Survey. Denver, Colorado. December 1955.
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Album caption: Long bar with multiplex projectors. Photogrammetry, Topographic Division, U.S. Geological Survey. Denver, Colorado. 1955. No index card.


map background search result map search result map Long bar with multiplex projectors, Denver, Colorado. 1955. Twinplex stereoscopic plotter, Denver, Colorado. 1955. Long bar with multiplex projectors, Denver, Colorado. 1955. Twinplex stereoscopic plotter, Denver, Colorado. 1955.