From what I can see, this is timber cut for a specific bill of materials or cut list, as opposed to standard dimensional timber.

Sämtliche Stücke sind laut Liste nummeriert und gestapelt.

http://www.welte-holz.at/html/listenbauholz.html

Construction timber
For the manufacturing of construction timber, we use only domestic, quality examined round timber from spruce, fir, standard pine, and larch. All order lists are carefully controlled and packaged, each single piece is labeled,

Bauholz nach Liste
Lieferbar sind sämtliche Längen und Querschnitte an Listenbauholz und Konstruktionsvollholz;
Alle Listen werden auftragsweise kontrolliert und paketiert, selbstverständlich sorgfältig aufgelattet und mit Einzelstück-Etikettierungen versehen.

http://www.gelo.de/xist4c/web/Bauholz-nach-Liste_id_62_.htm

A cut list, also called a cutlist or cutting list, is closely related to a bill of materials. In fact, many woodworkers treat them as one and the same. To quote from CutList Plus (a neat little utility for creating cut lists and sheet stock layouts), "A list of all the parts required to build a woodworking project is called a cut list. Each part is numbered and has a thickness, width and length." Using this definition, you can think of a cut list as a bill of materials for lumber and sheet stock without any of the cost information. Its purpose is to help you figure out how and where to cut each piece of wood.

http://www.woodbin.com/ref/design/billmat.htm