1953
| P&C purchases a total of 15,663 acres of timberland, bringing its holdings to 90,229 acres. The harvesting industry welcomes the hydraulic clamshell bucket, a new type of pulpwood loader.
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| 1954 | Timberland sells for $7.13 per acre.
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| 1957 | George D. Carlisle is elected assistant treasurer of P&C.
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1960
| George T. Carlisle dies suddenly at his home and is remembered throughout the community for his outstanding contribution to the forestry field. George D. Carlisle is elected P&C vice president and treasurer.
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| 1961 | P&C is contracted by the heirs of a long-time land-owning family to manage the largest tract of land in its history — 340,000 acres.
David Carlisle, grandson of George T. and son of George D., graduates with a degree in economics from Bowdoin College and begins work as a commercial lending officer in Boston.
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| 1963 | P&C purchases land in Enfield to be used as a wood yard and continues to grow both its timberland acquisition and wood operations divisions.
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| 1964 | Timberland sells for $10.31 per acre.
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| 1965 | The board of directors votes to borrow $75,000 to purchase logging equipment. Business booms and many workers are hired for peeling season.
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| 1967 | Philip Clement, president of P&C since 1960, retires, and George D. Carlisle becomes president of Prentiss & Carlisle. The first Wildlands Zoning hearings are held concerning zoning along the Allagash River.
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| 1969 | George D. testifies on the capital gains tax treatment of timberland returns before the House Ways and Means Committee in Washington, DC. |