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Vol. 2, January Special: First dreams of the New Year, p. 177 - 186 of the Omnibus: "Osaka's Dream" to "Dreams"
Favorite: "Just Like A Cat". It's interesting how different the dialogue is for how similar it is to the anime's version.
This volume has character heights as chapter dividers. Over the course of this volume, if you're keeping track, you'll find 4 of the students and the two female teachers within a 10-cm range.
At the low end of that range is Tomo, at 154 cm tall, or 5 feet and half an inch. She's the shortest of the main cast other than Chiyo.
At the high end of that range is Yomi, at 163 cm, or 5 feet and 4.2 inches. Only Sakaki is taller.
Other heights as they come up.