Main scientific interest, principles and procedures of organisation of numerized ‘data-base’ as 'source of knowledges' were critically described in the special issue of « Cellulose Chemistry and Technology, 2006, 40 (9-10) : 685-690 » focussed on lignin and plant cell walls chemistry and technology, outlined by some glance on the emergence of scientific concepts in the cases of cellulose, lignin and plants cell wall chemistry. A free public acces of this paper in Prodinra, is paper is freely at « http://prodinra.inra.fr/record/32691 ». The corresponding practical organisation of the related sets of electronic files as ‘documentary recollection’, named ReDoc for ‘Recueil documentaire’ in French, developed at INRA are illustrated here in one of the complete four specific domains 'C', biological chemistry, of the ReDoc data base.