| [CORRESPONDENCE FROM JOSEPH M. COLBY TO WALTER REGARDING APPRECIATION][WITH ATTACHMENTS] |
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| [CORRESPONDENCE FROM JOSEPH M. COLBY TO WALTER F. ROCKWELL REGARDING RETIREMENT] |
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| [CORRESPONDENCE FROM JOSEPH M. COLBY TO WALTER F. ROCKWELL REGARDING PERSONAL UPDATE] |
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| [CORRESPONDENCE FROM JOSEPH M. COLBY TO WALTER F. ROCKWELL REGARDING PERSONAL UPDATE] |
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| [CORRESPONDENCE FROM JOSEPH M. COLBY TO WALTER F. ROCKWELL REGARDING PAPER "A SAMPLE OF THE ATTITUDE OF AMERICAN INDUSTRY TOWARD THE PROPOSED CONVERSATION OF THE INCH SYSTEM TOE THE METRIC SYSTEM"] |
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| [CORRESPONDENCE FROM JOSEPH M. COLBY TO WALTER F. ROCKWELL REGARDING ENGINE-MOTOR FUEL REQUIREMENTS OF THE ARMY] [WITH ATTACHMENT] |
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| [CORRESPONDENCE FROM JOSEPH M. COLBY TO WALTER F. ROCKWELL REGARDING DURING WWII RESTRICTING THE USE OF 80 OCTANE FUEL FOR ARMY VEHICLES] [WITH ATTACHMENT] |
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| [CORRESPONDENCE FROM JOSEPH M. COLBY TO W.W. STOREY REGARDING LETTER OF JANUARY 12TH] [WITH ATTACHMENT] |
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| [CORRESPONDENCE FROM JOSEPH M. COLBY TO W.W. ROWLAND REGARDING PERSONAL UPDATE] |
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| [CORRESPONDENCE FROM JOSEPH M. COLBY TO W.W. RICHARDS REGARDING PHOTOGRAPHS] |
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| [CORRESPONDENCE FROM JOSEPH M. COLBY TO W.S. JAMES REGARDING C.L. SCOTT] |
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| [CORRESPONDENCE FROM JOSEPH M. COLBY TO W.P. BOATWRIGHT REGARDING TRIP TO WEST COAST] |
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| [CORRESPONDENCE FROM JOSEPH M. COLBY TO W.P. BOATWRIGHT REGARDING REPORT-DEVELOPMENT ITEMS] |
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| [CORRESPONDENCE FROM JOSEPH M. COLBY TO W.P. BOATWRIGHT REGARDING REPORT OF MAJOR J.J. ROBSON ON RUBBER PRODUCTS] |
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| [CORRESPONDENCE FROM JOSEPH M. COLBY TO W.P. BOATWRIGHT REGARDING REPORT OF LT. COL. E.H. HOLTZKEMPER] |
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| [CORRESPONDENCE FROM JOSEPH M. COLBY TO W.P. BOATWRIGHT REGARDING PATENTS] |
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| [CORRESPONDENCE FROM JOSEPH M. COLBY TO W.P. BOATWRIGHT REGARDING LETTERS] |
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| [CORRESPONDENCE FROM JOSEPH M. COLBY TO W.P. BOATWRIGHT REGARDING LETTERS OF APPRECIATION] |
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| [CORRESPONDENCE FROM JOSEPH M. COLBY TO W.P. BOATWRIGHT REGARDING LETTER FROM MR. N. DREYSTADT] |
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| [CORRESPONDENCE FROM JOSEPH M. COLBY TO W.P. BOATWRIGHT REGARDING FOR YOUR INFORMATION] [WITH ATTACHMENTS] |
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