My twins wrote some books

My twin boys R and J are no longer satisfied with merely drawing pictures, they now have to add words as well...

Fortunately I only own nine books, so there is plenty of shelf space for their literary masterpieces.

Here is one example by each:

TRUE FACTS ABOUT SPACE

Written and illustrated by J

In a nice touch, this book even has a catalogue reference number for borrowing purposes on the back cover (see bottom left):

NF
Tuc
In all good library non-fiction sections.

True to its title, this book contains True Facts About Space. There are a lot of words and pictures to convey this information. The only problem is most of the words are misspelt. Or perhaps they are written in 12th century English. It's hard to tell.

Here is an example, the pages of Earth and Mars:

Eath has 1 moon. Eath is the same sise as Mars. Eath and Mars are the bregest smll plases in sorrosestm. Eath is the one we live on.

Mars has 2 moons wechuter be astros. Did you new Mars yst ter have no moons but jupitd wherv hrs big gravde it nod tow asterod out of the asterod belt and cach them, and then thay bcam Mars's moons.

Illustrations are pretty good though, which is not unexpected:

Jupiter and Saturn pages.

UNTITLED

By R

After seeing this seminal work in astronomy, R decided to get into the book game.

From the front cover, he appeared to be writing on a similar topic:

It turned out, he was not: