I have found a very old book, dated 1883. It is written in a foreign
language. published in Chicago by Engberg & Holmbergs forlag in 1883.
Auther id D.A. SUNDEN. Title SVENSK SPRAKLARA. Where can I find out
what language it's wrote in and the possible value? Karen Tromp

Dear Karen, 

The language of the book is Swedish and it is supposed to be a
linguistics book (the title is "Swedish Grammar").

The pricing of an old book depends on its condition: if it is well
preserved, whole, and so on. The pricing depends also on the demand,
of course. Newer editions of the same book (from the 1910s and from
the 1920s) are being sold for sums ranging between $4.71 and $18.00.
You can see a list of these available, to learn more, by looking here:
Cache of "Svensk språklära." from ABE Titles. 
<http://64.233.183.104/search?q=cache:KLA3JEUBA-cJ:www.abetitles1.com/Title/919677/Svensk%2BSpraklara.html++Sprakl%C3%A4ra+sunden&hl=en>

It should be said, however, that these are only pricing for these
editions, depending on the condition of the copy. To get a more
accurate evaluation of your edition (an evaluation of which does not
exist online) and copy, you'll have to go to an antiquarian.

I hope this answers your question. Please contact me if you need any
clarifications on this answer before you rate it. My search terms have
been:
"Svensk språklära." and Sunden.

The author is Daniel Anton Sundén (1828 - 1910):

http://runeberg.org/uppsalla/0772.html

A more detailed biography (in Swedish) with a picture of the author:

http://runeberg.org/sbh/b0561.html