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.

See Contents and Abstracts The Shandean Volume 30 (2019).

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