General
📖 Freshwater Life: Britain & Northern Europe by Malcolm Greenhalgh & Denys Ovenden (Collins: 2007) [Adv]
↯ Natural History Museum [Adv]
Earthworms
📖 Key to the earthworms of the UK and Ireland by Emma Sherlock (Field Studies Council (FSC Aid gap, 2018)
Plant Galls
📖British Plant Galls by Margaret Redfern and Peter Shirley (FSC 2nd ed, 2011) [Adv]
📖Britain’s Plant Galls: A photographic guide by Michael Chinery (WILDGuides, 2011) [Adv]
📖Plant Galls (FSC Fold-out chart 2005) [Adv]