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How to Join Squares Seamlessly in Crochet - Whip Stitch Method Different...i like it
Flat Braid Crochet Join - Part 2 - Joining the First 2 Squares | Crochet Tutorial
Lots of good join- and edge ideas Scroll down to Scallop join How- to onGourmet Crochet
joining crochet blocks
Russian join yarn ends
Pattern & Tutorial for African Flower Hexagons with join-as-you-go instructions
Maybe a good way to use up leftover yarn. Esp. since you can do up to that point and then join-as-you-go with the white yarn?
Ravelry: Flat Braid 3-Ch Crochet Join Tutorial pattern by Margaret MacInnis. Long, photo heavy tutorial that is VERY GOOD. If you struggle with this method of joining or want to learn, then read/use this tutorial.