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CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS' CAPITAL - USD ($) | Subtotal | General Partnership | Treasury Units | Class A | Class B | Total
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2014 |  | $ (272,859) |  | $ (21,910,488) | $ (5,184,335) | $ (27,367,682)
Balance (in units) at Dec. 31, 2014 | 180,225 | 1,802 | 52,572 | 144,180 | 34,243 | 127,653
Increase (Decrease) in Partners' Capital |  |  |  |  |  |
Distribution to Partners |  | $ (37,859) |  | $ (3,028,706) | $ (719,318) | $ (3,785,883)
Stock Buyback |  | (33,878) |  | (2,752,393) | (643,682) | $ (3,429,953)
Stock Buyback (in units) |  |  | (2,279) |  |  | (2,279)
Net income |  | 37,726 |  | 3,018,052 | 716,787 | $ 3,772,565
Balance at Dec. 31, 2015 |  | $ (306,870) |  | $ (24,673,535) | $ (5,830,548) | $ (30,810,953)
Balance (in units) at Dec. 31, 2015 | 180,225 | 1,802 | 54,851 | 144,180 | 34,243 | 125,374
Increase (Decrease) in Partners' Capital |  |  |  |  |  |
Distribution to Partners |  | $ (67,297) |  | $ (5,383,743) | $ (1,278,639) | $ (6,729,679)
Stock Buyback |  | (16,181) |  | (1,311,328) | (307,436) | $ (1,634,945)
Stock Buyback (in units) |  |  | (965) |  |  | (965)
Net income |  | 49,508 |  | 3,960,682 | 940,662 | $ 4,950,852
Balance at Dec. 31, 2016 |  | $ (340,840) |  | $ (27,407,924) | $ (6,475,961) | $ (34,224,726)
Balance (in units) at Dec. 31, 2016 | 180,225 | 1,802 | 55,816 | 144,180 | 34,243 | 124,409
Increase (Decrease) in Partners' Capital |  |  |  |  |  |
Gain (Loss) on Disposition of Oil and Gas and Timber Property |  |  |  |  |  | $ 104,443
Distribution to Partners |  | $ (79,858) |  | $ (6,388,668) | $ (1,517,309) | (7,985,835)
Stock Buyback |  | (426) |  | (34,038) | (8,084) | $ (42,548)
Stock Buyback (in units) |  |  | (23) |  |  | (23)
Net income |  | 69,379 |  | 5,550,345 | 1,318,207 | $ 6,937,931
Balance at Dec. 31, 2017 |  | $ (351,745) |  | $ (28,280,285) | $ (6,683,147) | $ (35,315,177)
Balance (in units) at Dec. 31, 2017 | 180,225 | 1,802 | 55,839 | 144,180 | 34,243 | 124,386

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