Four new eJAAVSO preprints

ej216: "BVRI Photometry of SN 2011fe in M101" by M. W. Richmond and H. A. Smith

ej217: "The Pulsation Period of the Hot Hydrogen-Deficient Star MV Sgr" by J. R. Percy and R. Fu

ej218: "Period Changes in RRc Stars" by J. R. Percy and P. J. Tan

ej219: "The Citation of Manuscripts Which Have Appeared in JAAVSO" by A. U. Landolt

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