提交 1cd6fd40 编写于 作者: M Michał Kujbida

Update free-programming-books-pl.md

Added Polish Scala book.
上级 60a596d2
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* [Prolog](#prolog)
* [Python](#python)
* [Ruby](#ruby)
* [Scala](#scala)
* [SQL](#sql)
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### Ruby
* [Ruby](http://pl.wikibooks.org/wiki/Ruby)
### Scala
* [Język programowania Scala](http://www.grzegorzbalcerek.net/jps2/index.html)
### SQL
* [SQL i PL/SQL – podstawy](http://jsystems.pl/storage/sqlplsql1.pdf)
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