(a) Claims for taxes against property so returned must be entered by the bureau in the office thereof in suitable dockets.

(b) Not later than the thirtieth day of June, each year, the bureau shall make up from the tax returns received from the taxing districts, as aforesaid, a claim for each property returned, which shall contain the unpaid taxes against such property, which are due all taxing districts as found in the various returns. Such claims shall be entered by the bureau in a suitable claim docket and may be in the form of written or typewritten lists. A claim shall cover the unpaid taxes due all taxing districts, but the amount due each taxing district shall nevertheless be shown separately. A number of years' taxes of different kinds may be included in one claim. Any claims shall be amendable by leave of the bureau upon notice to the defendant as the bureau may require.