I nclude the bone marrow, lymph nodes, spleen, and thymus. Precursor cells in the bone marrow produce lymphocytes. B-lymphocytes (B-cells) mature in the bone marrow. T-lymphocytes (T-cells) mature in the thymus gland. Besides providing a home for lymphocytes (B-cells and T-cells), the ducts of the lymphatic system provide transportation for proteins, fats, and other substances in a medium called lymph.
A book that is made with a stiff paper cover and bound directly to the text block. Many paperback books are converted to hardcover books by mylar binding. Perfect bind
  Block Printing or Woodblock Printing is a method used to print text, images or patterns on textiles and later paper.lock Printing was invented by the Chinese in the 7th century AD. Also it was first imported from china in the 14th century and was used for printing text, images or patterns â¦ and was used to make books,cards, carms and calenders!!!!!!!