Found the following hamletworks.org entries referring to line 713
View Material Textual Note for 712
712
Ghost. Murther most foule, as in the best it is,
1.5.27
View Commentary Note for 713
713
But this most foule, strange and vnnaturall.
1.5.28
View Material Textual Note for 713
713
But this most foule, strange and vnnaturall.
1.5.28