اذا لم تجد ما تبحث عنه يمكنك استخدام كلمات أكثر دقة.
"List of Harvard papers on determination of atomic weights": p. 91-94
Further investigation concerning the atomic weights of silver, lithium and chlorine. By T.W. Richards and H.H. Willard.- The Harvard determinations of atomic weights, between 1870 and 1910.- Methods used in precise chemical investigation
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