Subject |
---|
1809 [4] |
1810 [6] |
1811 [6] |
1813 [1] |
Acids [1] |
Addition [1] |
Air [1] |
Alkali [1] |
Apparatus [1] |
April [10] |
Arithmetic [1] |
Astronomy [3] |
August [6] |
Barometer [1] |
Benjamin Franklin [1] |
Calculation [1] |
Catalogue of books [1] |
Chemicals [1] |
Chemistry [8] |
China [2] |