The marbling on the cover of Volume 30 (2019) is taken from Tristram Shandy, A New Edition, Altenburgh: for Richter and Boehme, 1772,  volume 3 between pp. 10-11, varnished with gum, verso blank.

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The Shandean Volume 30 (2019) will be published in November 2019. 
You can order this volume now.