The Tregian Manuscript(London, British Library MS Egerton 3665) is Francis Tregian the Younger(1574-1618)'s very huge and famous Collection, including over1000 pieces.
The Tregain Manuscript includes 13 Fantasias à5 by R. Deering.
My numbering is
Tr. Ms. = Tregian Manuscript
411 = serial Number
Tr.1 = book 1
89, 1 = first number & second number
No.1
bar1-36 : A part, 2 themes
bar36-54 : B part
bar55-82 : C part
bar82-94 : D part