Found the following hamletworks.org entries referring to line 710

View Commentary Note for 710
710 Ghost. Reuenge his foule, and most vnnaturall murther.1.5.25

View Immaterial Textual Note for 710
710 Ghost. Reuenge his foule, and most vnnaturall murther.1.5.25

View Material Textual Note for 710
710 Ghost. Reuenge his foule, and most vnnaturall murther.1.5.25

View Commentary Note for 711
711 Ham. {Murther!} <Murther?>