“Autumn’s Bloom Coaster” is a free crocheted Coaster pattern by Denise Augostine.
It can be found on the Internet Archive. However, the associated Internet Archive photo is missing on this coaster’s pattern page:
http://web.archive.org/web/20040501194334fw_/http://denis...

Materials:

Size 10 crochet cotton - the pattern recommends a small amount ecru (the front piece) and dark green (the back piece), or your favorite colors

Size 7 (1.65mm) steel crochet hook

Gauge:
Rnds 1-3 of base = approx 1½ inches diameter

Finished Size:
4½ inches diameter from point to point.

The pattern contains written instructions.

The edging of the two pieces is added while joining the back piece to the front piece, and happily it doesn’t require you to cut the thread after crocheting the back piece. When you come to the end of the last round of the back piece you simply join that round, and turn your work. Then you follow the instructions for joining the two pieces together.
♥