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<iframe name="ngram_chart" src="https://books.google.com/ngrams/interactive_chart?content=liberal+principles,liberal+plan,liberal+policy,liberal+government,liberal+system,liberal+ideas&year_start=1758&year_end=1820&corpus=26&smoothing=1&case_insensitive=true" width=900 height=500 marginwidth=0 marginheight=0 hspace=0 vspace=0 frameborder=0 scrolling=no></iframe>
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1820
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Search in Google Books
liberal principles
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1758 - 1776
1777 - 1781
1782 - 1785
1786 - 1816
1817 - 1820
English
liberal plan
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1758 - 1773
1774 - 1777
1778 - 1780
1781 - 1812
1813 - 1820
English
liberal policy
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1758 - 1783
1784 - 1812
1813 - 1815
1816 - 1818
1819 - 1820
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liberal government
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1758 - 1783
1784 - 1814
1815
1816 - 1817
1818 - 1820
English
liberal system
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1758 - 1782
1783 - 1811
1812 - 1814
1815 - 1817
1818 - 1820
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liberal ideas
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1758 - 1774
1775 - 1790
1791 - 1793
1794 - 1817
1818 - 1820
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