Letter from D. W. Kempner to F. H. Riegelmeier stating he would rather have one shipment.

Letter from F. H. Reigelmeier to D. W. Kempner acknowledging his order and asking whether he would like to split the shipment or ship all of the plants when they're all ready.

Letter from D. W. Kempner to Riegelmeier's, placing an order for Cibotiums, Areca palms, and a tub of Philodendron Pertusum.

From Forward: "The value of this survey of the carbonizing properties of American coals by a standard method lies in the comparability of the results on different coals. It must recognized that no standard laboratory method of carbonization, even on a large unit, can yield results that exactly duplicate those obtained in ovens and retorts. The commercial results vary with the type of oven or retort. Allowance must be made for such differences in interpreting the BM-AGA test results in terms of commercial plants."

From Introduction: "The purpose of this investigation was to separate and identify as many of the principal phenolic compounds produced by the mild hydrogenation of Pittsburgh-bed (Bruceton) coal as possible and to determine with the greatest possible accuracy the proportions in which they are present."

From Summary and Conclusions: "This report deals with upgrading to metal-lurgical standards of large reserves of high-sulfur Pittsburgh coal remaining in southwestern Pennsylvania and northern West Virginia."