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592
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587
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UNT Libraries Government Documents Department
587
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3
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2
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573
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14
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5
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Texas Patents
573
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14
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5
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572
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3
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47
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44
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38
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23
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22
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20
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15
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11
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10
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10
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47
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44
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38
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23
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22
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20
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15
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11
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10
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10
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9
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8
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8
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7
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7
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7
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6
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5
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5
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4
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4
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3
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9
1980-1989
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1920-1929
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1880-1889
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205
1900-1909
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86
1880-1889
65
1870-1879
40
1860-1869
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Year
2013
1
2008
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2005
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2004
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2001
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1999
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1993
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1991
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1990
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1983
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1
1922
4
1921
8
1920
18
1919
16
1918
21
1917
21
1916
15
1915
38
1914
9
1913
18
1912
45
1911
9
1910
13
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35
1908
9
1907
22
1906
16
1905
12
1904
5
1903
10
1902
10
1901
8
1900
19
1899
4
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3
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16
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2
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16
1894
10
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4
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18
1891
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1887
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1886
16
1885
7
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9
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1877
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1875
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1874
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1869
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Month
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37
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