(Copy) This agreement made this twenty-fifth day of February, eighteen-hundred-and-sixty-nine, between J. W. Powell, party of the first part, and J. C. Sumner, W. H. Dunn, and O. G. Howland, party of the second part, witnesseth, that the said party of the second part agree to do the following work, respectively, for the party of the first part, namely:  J. C. Sumner agrees to do all necessary work required with the sextant; W. H. Dunn to make barometrical observations night and morning of each day, when required, also to make observations when needed for determining altitude of walls of the Canon, also to make not more than sixty-two hourly series of not more than eight days each, he to have the aid of an assistant for the last two mentioned classes of observations; O. G. Howland to make a topographical drawing of the course of the rivers.  The above and foregoing work to be performed during the proposed exploration of the Green River, from Green River City, Wyoming Territory, to the Colorado River, and of the Colorado River from that point to Callville, (blank space left here evidently for the insertion of the name of the territory in which Callville was situated.  F.S.D.)_________; the party of the second part to perform the foregoing work to the best of their ability; the party of the second part also agreeing to do a fair proportion of the work necessary in getting supplies and boats safely through the channels of the aforementioned rivers, for use of the expedition; and also agreeing to save for specimens for stuffing, for the party of the first part, all suitable skins of animals which they may collect while engaged in the above exploration of the Green and Colorado rivers, J. W. Powell, party of the first part, agreeing to allow the party of the second part five days at one time for prospecting for gold and silver, if not too often; also to allow thirty days to the party of the second part for hunting and trapping between the first day of September and the first day of December, eighteen-hundred-and-sixty-nine, and sixty days between the first day of January and the first day of June, eighteen-hundred-and-seventy; the party of the first part also agreeing to pay to the party of the second part, respectively, twenty-five dollars each per month for the time employed in all such service, and also agreeing to pay in addition the annexed prices for all skins procured for him by the party of the second part; J. W. Powell, the party of the first part, to furnish boats, supplies, ammunition, etc., sufficient for the use of the expedition.  This agreement to go into effect the first day of June eighteen-hundred-and-sixty-nine, and not to continue over one year.

Should it be necessary to proceed on the journey, without delay on account of disaster to boats or loss of rations, then the time specified for hunting may not be required by either party, nor shall it be deemed a failure of contract to furnish supplies should such supplies be lost in transit.