This is the fifth and last book for my 50 granny squares challenge. It’s called “200 Crochet blocks for blankets, throws and afghans” by Jan Eaton. This square can be found on page 46
The instructions in this book are not as basic as the previous books because it defines the clusters as made from either 3 or 4 stitches and assumes that you know what a cluster is. For those who don’t, a cluster is made by not performing the last yarn round needle then pulling through the last loop but leaving that last loop on the needle until the recommended number of stitches then the yarn round needle is pulled through all the remaining loops.
It is marked as two out of three levels meaning some experience is required but I found it straight forward enough.