When using Chicago Manual of Style (CMOS), if you have more than one citation that relates to one or more concepts or ideas, all the relevant citations may be added under the same footnote and separated by a semi-colon.
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Several citations in one note
The number of note references in a sentence or a paragraph can sometimes be reduced by grouping several citations in a single note. The citations are separated by semicolons and must appear in the same order as the text material (whether works, quotations, or whatever) to which they pertain. Take care to avoid any ambiguity as to what is documenting what.
