Here is the listing of titles for the entire series, which span multiple digitization efforts:
Volume 1:
-- #23041 Introduction and Publisher's Advertising
-- #23042 The Tempest
-- #23043 The Two Gentlemen of Verona
-- #23044 The Merry Wives of Windsor
-- #23045 Measure for Measure
-- #23046 The Comedy of Errors

Volume 2: #45128
-- Much Ado About Nothing
-- Love’s Labour’s Lost
-- A Midsummer-Night’s Dream
-- The Merchant of Venice
-- As You Like It

Volume 3: #50559
-- The Taming of The Shrew
-- All's Well That Ends Well
-- Twelfth Night; or, What You Will
-- The Winter's Tale

Volume 4: #50095
-- King John
-- King Richard II.
-- The First Part of King Henry IV.
-- The Second Part of King Henry IV.
-- King Henry V.

Volume 5: #49297
-- The First Part of King Henry VI
-- The Second Part of King Henry VI
-- The Third Part of King Henry VI
-- King Richard III

Volume 6: #49007
-- King Henry VIII
-- Troilus and Cressida
-- Coriolanus
-- Titus Andronicus

Volume 7: #47715
-- Romeo and Juliet
-- Timon of Athens
-- Julius Cæsar
-- Macbeth

Volume 8: #49008
-- Hamlet
-- King Lear
-- Othello

Volume 9: future
-- Antony and Cleopatra
-- Cymbeline
-- Pericles
-- Poems

Wikipedia page about this book: https://en.wikipedia.org/wiki/Complete_Works_of_Shakespeare

Release date is 2015-06-27

King Henry VI, parts I-III -- The first part of the Contention of the two famovs houses of Yorke & Lancaster -- The true tragedie of Richard duke of Yorke ... -- King Richard III.

Produced by Jonathan Ingram, RichardW, and the Online
Distributed Proofreading Team at http://www.pgdp.net

"The Works of William Shakespeare [Cambridge Edition] [Vol. 5 of 9]" by Shakespeare is a volume containing plays and poems from the complete works of William Shakespeare. This collection encompasses the playwright's diverse repertoire, traditionally organized into histories, tragedies, and comedies. The Cambridge edition represents one of several academic compilations that have preserved Shakespeare's literary legacy. Some editions include collaborative works with other playwrights, reflecting the complex authorship questions surrounding certain plays attributed to the Bard. (This is an automatically generated summary.)

Original publication data not identified