Blue Heaven: Encounters with the Blue Poppy by Bill Terry from amazon
Bill Terry is a leading North American authority on Asiatic poppies relates his own encounters with the blue poppy and shows how, given a suitable climate, a patient and persistent gardener can raise this most alluring of perennial plants.
The origins of Meconopsis are expounded along with comments about those who first discovered and grew the plants. A personal account, fun to read and adds to the collective knowledge.

Meconopsis the ‘hardy plant series’ is also still available via amazon

All that is Meconopsis is not blue:

The Meconopsis group link

‘Portraits of Himalayan Flowers’

‘The Poppy Family in the Wild and in Cultivation’ has a good section on the ‘Blue Poppy’

Read Tips for Growing Meconopsis