Found the following hamletworks.org entries referring to line 159
View Commentary Note for 159
159
{This}
<The>
bird of dawning singeth all night long,
1.1.160
View Immaterial Textual Note for 159
159
{This}
<The>
bird of dawning singeth all night long,
1.1.160
View Material Textual Note for 159
159
{This}
<The>
bird of dawning singeth all night long,
1.1.160