search materials(including e-books and e-journals) held by Hokkaido university.
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Search keyword：(Subject: #Extraterrestrial beings)
A flying birthday cake? / by Louis Sachar ; illustrated by Amy Wummer
New York : Random House , c1999. - (A stepping stone book ; Marvin Redpost ; 6)
Aliens and energy / by Agnieszka Biskup
: pbk.. - Mankato, Minn. : Capstone Press , c2012. - (Graphic library ; . Monster science)
Butterfly battle! / by Courtney Carbone ; illustrated by Pernille Ørum-Nielsen
: pbk. - New York : Random House , c2018. - (Step into reading ; Step 3 ; Reading on your own . DC super hero girls)
January joker / by Ron Roy ; illustrated by John Steven Gurney
New York : Random House , c2009. - (Calendar mysteries). - (A stepping stone book)