It had a six issue run, all of which are now published together in a trade paperback collection.
By the time Violet died in 1915 they had published fourteen books together.
Issues 4/5 and 6/7 were published together as single books.
The individual works were composed at different times and published together in 1852.
These books were published together as a single volume in 1931.
If finished and published together, they might have made a novel.
The first two stories were published together in book form in 1972.
If enough material was ready, 128 or even 192 pages would be published together.
The three Christmas books marked with ** have been published together.
Each was originally a separate work but they were later published together.