There will be more exercises for downloading yet, but here are some for starters:

Patti's Ten Commandments
Ten daily exercises for the voice
Patti's Ten Commandments exercises.pdf
Adobe Acrobat Document 618.2 KB
Rossini's Vocalises
A set of eighteen daily unaccompanied vocalises.
Rossini 1.pdf
Adobe Acrobat Document 4.0 MB
Rossini's Solfèges, the first two
Two accompanied solfèges.
Rossini 2.pdf
Adobe Acrobat Document 3.3 MB
Rossini's Solfèges, the other two
Accompanied solfèges, the next two.
Rossini 3.pdf
Adobe Acrobat Document 3.9 MB
Cover sheet of Rossini's Vocalises et Solfèges
The printed cover sheet.
Rossini cover.pdf
Adobe Acrobat Document 405.4 KB
Who is Sylvia, as performed by Liza Lehmann c.1890 in London
Valuable & interesting advice on portamento and 'binding' and 'slurring' by a pupil of Jenny Lind (see Tip 258)
Who is Sylvia.pdf
Adobe Acrobat Document 2.9 MB