Is there a standard scholarly reference for lattice constants of crystals of the elements?
The CRC Handbook of Chemistry and Physics contains a dedicated compilation by H. W. King, titled «Crystal Structures and Lattice Parameters of Allotropes of the Elements».  In case your research library is closed, you may access some of its editions freely or borrow them with the library card of archive.org.
In case of the 97th edition (by 2016), the section starts by page 12-16.  (Elements liquid or gaseous at ambient conditions are included.)

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